Hi,
My '95 SSEi accelerates normally from a stop, but when I'm at around 50 and floor it, it bucks and sputters. Not as bad when I floor it at 80 though, for some reason. New parts in last year: engine computer, crank sensor, fuel filter. All I can think of is something in the fuel system or maybe the coil packs?

thanks in advance...

When I've had a similar issue, it was either the coil packs or the ignition control module.

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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 forgot to mention the check engine light is not on.

There should be a procedure in the techinfo section on how to use a voltmeter to test coils and ICM. I've used it to find out I had bad coils before but I had different symptoms. Nonetheless I'd test them if I were you. http://www.pontiacbonnevilleclub.com/fo ... =48&t=1683