Yea so then its not that its either

1. Bad wire which is oem on cyl 6
2.Something is loose
3.Or something that has nothing to do with the plugs

A few times before I changed the plugs the check engine light would sometimes go on and off once I hit a quarter tank it would go on..if I filled up the light would go off..the car does feel rough sometimes..I'm planning on changing the fuel filter soon..could it possibly be fuel pump? Fuel pressure?

My coworker's car recently got gas so bad that it wouldn't run. A new fuel filter and two bottles of ISO-HEAT later, it ran for 10 minutes, then got random mis-fires codes, and then died, showing clear symptoms of a clogged filter. If you press the test port needle valve right after turning the car off, you should get a good strong spray (be prepared for fuel...). If it's just a burble, there's a good chance the filter is clogged or the pump wasn't making good pressure to begin with. I think pressure should be 45ish psi?

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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
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im also starting to think maybe the gap may be wrong. i checked the plugs and i remember them being .060 and ive always been told to not gap iridiums..does any one know if ac delco iridium 41-101 come gapped already at .060?

They should be pre-gapped at .060. The reason you shouldn't try to gap them is that you'll break the electrode off. Happened to me when I tried it...

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Bye Bye:

RIP sandrock

Yeah another fact about this install I did..when I started the car smoke came out of the rear plugs I'm assuming its because of the lubricants I used it went away after few min of idle could that have caused damage?

I didn't gap the NGK iridium plugs in my LeSabre. It runs very well with them.

Any additional lubricants burning externally from installation won't cause damage. Well, not to the car at least.

Did you change the #6 wire? Change that first before worrying about plug gap.

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2012 Chevrolet Cruze Eco - Current car

1999 Buick LeSabre Custom - Former car

Learn from the mistakes of others, that way when you mess up you can do so in new and interesting ways.

Yea i changed it and it worked thanks for the help guys, now to get rid of this p0171 ha

are the coils original if so they do break done after time such was the case with my bone i replaced them for about $30 a piece