SOURCE: car runs rough at idle
clean out ur throttle body, just follow the hose from the air filter to the throttle body. Need 2 people to do this. Don't remove the hose completely from the throttle body. Just enuff to be able to spray ur intake cleaner into the throttle body. Do this especially if its worse when the motor is hot, as this would confirm the problem.
SOURCE: 1998 chevy k1500 vortec 305, high idle, surges a
TPS probably not cause surging idle. Could be IAC motor, could be MAF sensor. If you dont have a check engine light I would be thinking IAC motor.
SOURCE: 1994 chevy with 5.7 L
Sounds like you have a vacuum leak. When the engine is cold the leak is there but as the engine warms up the parts start to expand thus closing the gaps and sealing the leak. I had this problem on my personal vehicle and it turned out to be lower intake gaskets.
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