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Expert
92 Answers
- Posted on Sep 29, 2009
Re: I got a 1994 gmc s15 jimmy with the vortec 4.3 it...
Sounds like it could be a problem in the IAC circuit. The Idle Air Control valve manages how much air gets into the engine while @ idle. It receives commands from the ECM based on inputs from at least the mass air flow, coolant temp, throttle position and oxygen sensors
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