Question about 1985 Pontiac Fiero
Check the crank trigger sensor as well this can be presenting the way you described i dont feel it is the throttle position sensor but you may want to test that as well if the crank sensor comes back clean
Posted on Oct 11, 2008
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Posted on Jan 02, 2017
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Oct 13, 2014 | Cars & Trucks
Engine stalls or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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