Unconsistant Idle/Stall

Miller

Registered User
cars a 89 or 90 sc.. i forget ( not my car )

I swapped an engine from one car to another and I am having a problem with it running. The car will idle fine for a few minutes then suddenly idle will drop very low or stall - then be hard to start. The vac is around where it should be.
It seems as if its the ecu controling it due to how sudden the change is. The cam sensor has been swapped out, the IAC has been also. I have checked all vac lines and everythings tight.



The TB i have on there has the adjustment for the IAC. I have another car thats the same and the TB has a different set screw and it dosent have an adjustment for the IAC. does it have a late model Tb on it and does it make a difference.
 
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