kennebellgt

I am having a severe idle problem with my 95 gt, mods in sig.
i have this problem to where the car will not idle, I've cleaned the maf sensor it's only a year old anyway, My fuel pressure is set at 38psi vac. line off, I tried messing with the air bypass set screw on the throttle body but that didnt help either, I've always had this problem, seem's like I've had it ever since I put 24lb injectors on, I have the 24lb sample tube for the 24lb injectors that installs in the c&l mass air housing, I've checked all the injectors, I can not figure out what is causing this, the car's rpms fluctuate a few times than it dies immediately, what used to work was setting the fuel pressure down to 32psi than it would idle almost perfect, this seems odd to me, One thing is, If I give the car a vac leak ( taking a rubber cap off the vac. tree on the manifold ) it idle's perfectly, but as soon as I plus the vac leak up it dies, I,ve tried replacing the iac, that did not work, Any Idea's?

zebo87

do you have any codes. id run but it sounds like it could stand to be tuned. theres def an air to fuel ratio issue. what about your iac.

kennebellgt

I replaced the iac, still nothing, Airfuel ratio, that cant be fixed using my Fuel pressure regulator?

mattdel

given that it runs perfect with a vacuum leak, i'd say you have a serious enrichment problem. Injector(s) stuck open, FPR stuck open, vacuum source to the FPR pinched, etc...