pulsating of the rpms MODDED

**rczzv** · 06-28-2008

Hey guys I have a 2004 Pontiac Grand Prix GT2 with the 3800 non supercharged with k&n cold air intake a gt competition cam, pro magnum roller rocker arms, Ge forged pistons, zzp offroad down pipe and MSD plugs and wires, reprogramed ECU and corsa exhaust from pfyc everything else was purchased from zzperformance but know when im at an idol sitting in park my car pulsates like small little revs and it does it with the ac on and off. I think I might have a coil pack issue but I wanted to ask the experts let me know what you think.
Thanks
Zac

**Toofastgs** · 06-28-2008

make sure your cam timing was right?

**GP2003GT** · 06-30-2008

as was suggested to me, you might need to get your car tuned..

**Bio248** · 06-30-2008

with that amount of mod work and no tuning besides a flashed (as far as i know) pcm you car is way out of whack. you need a tuner to know what is really up. either you have a vacuum leak or you're just going to deal with a rough idle from having modded your car.

2 guesses, one answer.

wisconsin where? i have a scanner for borrow or you can entertain me for a night depending upon distance.

**rczzv** · 06-30-2008

Im in Waupaca WI but I go to Appleton alot and pretty much where ever that would be cool if you could help me out where are you at maybe we can meet up

**Bio248** · 06-30-2008

plenty far away.

appleton is a few hours from me and im not ever in that area. sorry, cant help ya.

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