I'm having a rough idle problem but noticed when i unplug the injectors on one side 2,4,6 there is no difference in how the engine runs even with all 3 unplugged.. Have tried one at a time on that side and still the same. Could i be missing a fuse for these somewhere? 1,3,5 are fine

The same fuse supplies power to all six injectors. The pink/black wires have 12 volts while the key is in the run position. I'd start by checking the voltage of all six pink/black wires.

If 2,4 & 6 don't have 12 volts then check the wiring for damage.

If all six have 12 volts then check for injector pulse with a node light or #194 automotive light bulb.

Report back if 1,3,5 have pulse & 2,4,6 don't.

If all six have pulse then check compression on all six cylinders.

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2006 Chevy Monte Carlo SS

I swear I've seen this problem before but I'm not recalling the cause... Do the two banks have seperate grounds?

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

Not that I recall. All 6 share the same ground through the PCM.

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Click here for mod list for both cars
93 SSEi, 95 SLE (supercharged) 97 Buick LeSabre Limited
PontiacDad at WCBF '04: Cruise control? That's like surrendering!
Comprehensive guide to troubleshooting, rebuilding, and modifying Eaton Superchargers

Ok, then to me it seems like the PCM or damaged wiring.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

We need to know if there's injector pulse or not.

Remove a 194 bulb from a taillight, and bend the wire contacts outward. They will then plug into each injector connector. It should glow when you crank the engine (disconnect all 6 connectors first so you don't flood the engine while doing this).

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Click here for mod list for both cars
93 SSEi, 95 SLE (supercharged) 97 Buick LeSabre Limited
PontiacDad at WCBF '04: Cruise control? That's like surrendering!
Comprehensive guide to troubleshooting, rebuilding, and modifying Eaton Superchargers

OK let me go into exausting detail. All wires have 12 volts. All injectors checked out with 15 ohms. All wires pulse when turning over the engine. While engine is running and unplugging wires 1,3,5 one at a time engine boggs down. Unplugging wires 2,4,6 has no effect on the engine weather one at a time or all at once. Engine revs up fine EVEN with all 3 injectors (2,4,6) unplugged. Replaced plugs,plug wires,checked coil pack and ICM all good. I cant beleive the the engine could run with only one side getting fuel.

I'd suggest you aren't getting any spark on the back bank, but that would rule out any spark because the spark plugs fire in pairs.

If you start the engine and let it run with a bulb in one of the injector connectors, does it light up?

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

Make sure the rear spark plug wires are going to the correct cylinders. If that checks out then check the compression.

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2006 Chevy Monte Carlo SS

Interesting thread, I'm following for sure.

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Update.. Good compression, good spark all plugs and cylinders... Let me restate once again.. the injectors 2,4,6 unplugged DO NOT change the running of the engine. and all injectors checked out all injector wires checked out.

It's weird enough that I would try a different PCM.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

I guess we were assuming the rear cylinders were not firing when the rear injectors were unplugged. I'm now thinking that you're saying the rear cylinders might be firing even though the injectors aren't plugged in.

Try checking the vacuum line going to the fuel pressure regulator for any signs of fuel leaking past the diaphragm. Hmmm, now that I typed that it seems that would also supply fuel to 1,3 & 5. Maybe the rear injectors are leaking fuel. We've seen very little trouble with fuel injectors & it's hard to believe something would happen to all three rear injectors.

Are you driving the car with the rear injectors unplugged or just letting it idle?

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2006 Chevy Monte Carlo SS