ok I need some help here!!! I have a 89 Iroc Z 350 TPI Well I just got the engine rebuild and when I start it the idle is way up to 1500 and it stays no matter what. Even when its warmed up it dont make any difference. I put it in drive and its at 1000 or 1100. I have changed the mass air flow sensor and relay. I have tried to adjust the idle by the idle screw, but for some reason the throttle thing wont even touch the screw. I try to push it back towards the screw but no nothing. Well let me know what you think or how I should adjust it. Thanks Joey

 

mine did the same thing, turned out to be a vacuum leak between the carb and the intkae manifold. check for that.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei
'95 3.23 rearend
hotchkis rear suspension

 

My 89 w 350 TPI did the same thing for a while...

until I adjusted the timing, adjusted the TPS sensor, cleaned my throttle body, set my fuel pressure and set the idle screw after disconnecting the IAC motor... i got the process from the tech articals..

good luck

 

As previously mentioned, vacuum leak, timing. It'd also do this if you forgot to plug the IAC motor back in. That's kinda a longshot, but easy to check.

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91 Z28
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