I.Flaherty

I got an 87 GTconverted to an 89 harness with an sn89, proM calibrated 30lb mass air, E 303, full exhaust, intake . etc. Latley the car sounds like it has areal radicalcam in it and the idol from start up especially after its sat for a few hours ranges from 1,200-500rpm if not shutting off. Once the car runs for a mile or two the idol goes back to normal but once and a while will drop and raise while stopped at a light or something. The car usually will buck under 1,500 in gear but latley bucks in the bottom end of everygear and has serious throttle hesitation.i step on the gas and the car bucks the rpms raise bucks some more thenjust about around 2,300 or around making boost the hesitationis gone. Theentire car has only 55,xxx on it.I changed the plugsand gapped for the supercharger i believe .35. The supercharger itself was rebuilt last summer, the mass air meter has been cleaned, timing played with multiple times but lined up dead on with the notch previously made when timed with a light. Im about the change my fuel filter but after that im all out of ideas. Anyone think they know whats up?

cundnracing

Hi
Do you have an adjustable fuel regulator? If so you need to have the fuel around 40-42 with car off and key on and if you do not have one get one. It sounds to me like you do not have the fuel adj. correctly. Also do you have 30LBS Injectors in the car? I know it is a dume question but you would be amazed. Also do you have an FMU for the supercharger anddoyou know if it iscalibrated to 30IBS injestors. Is you timming atleast on 10 deg. Youplugs can be ran on 40-45 sometime 50 as long as you have an after marker coil, only with nitorus you really have to gap you plugs smaller natural air is not so bad on the plugs.Also have you replaced the distributer cap because the little button that rides on the rottom will go bad, it should have a spring to in not just stuck in. Answer some of myquestions and we will go from there. Thanks &take care!

I.Flaherty

Hey hows it goin? I do not have an adjustable fuel regulator but my fuel pressure is 40-42 i have a under the hood guage and one in the car and yes i have 30lb injectors with a ProM mass air meter also calibrated to the injectors, i also replaced my distributor around march or so.