mine is doing the same thing. when its hot it doesnt do it when i crank it doesnt do it. but when im letting it warm up the rpm fluctuates like hell. it is my brake booster the diapraghm inside the booster is cracked or the seals have gone bad. cause one massive vacuum leak. try when your car is crank press the brake pedal down in a steady but fast pace. repeat the step and if its the brake booster it will really wanna kill your engine. im not talking about the flucuation because of the brake booster taking the vacum from the engine im talking about violent shaking and it feels like the car wants to stall.
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89 Supra Boosted 11psi
lexus afm
k&n air system
aeromotive fuel pressure regulator
walboro fuel pump
stage 3 weitght reduction
koki style tail lights
silver and black 2 tone paint
Enkei rs7 17" 17.5lbs each
hankook ventus hr2's 225/45/17
apc hood pins
yellow fogs
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Soon To be
Megan racing seats, roll bar, either takata or sparco harnesses
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