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02-26-2008
I have a 1998 GTP on a cold start it idle just right until it warms up then the rpms jump up and down maybe 200rpms i have checked for vacuum leaks. And there is none so what else could it be? It has a N* on it with a ported blower and a FWI. It has been doing this before I ever put mods on it.
02-26-2008
there are a few things that can cause that, a bad plug or wire, a failing coil, failing module, internal engine wear (blowby, and the like) without testing ever single component it will be tough to narrow down
02-26-2008
I have changed the wires and plugs
02-26-2008
have you done a seafoam treatment? Won't hurt (if done properly)
02-26-2008
no I haven't but I am about to put a s1x in it.
02-26-2008
No offense, but find the prob first, cause If you add the cam and it gets worse or causes something else to go wrong, you may be further up a creek than when you started
~end rant
Edit, do you have a tuned pcm, it may be required for the mods you have already
02-26-2008
I dont have a tuned PCM but it was doing it when I bought the car stock.
02-26-2008
does your tach act normal?
also could check the IAC on the TB. (clean w along with the rest of the TB)
02-26-2008
That would be my guess.Originally Posted by Toasty
02-27-2008
no my tach arm moves up and down under 1000rpms
02-27-2008
the IAC is new on a N*
02-27-2008
but the tach movement matches the rpms, right?
02-27-2008
yea I wish I could take a video.
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