Question about Chevrolet Cavalier
Sounds like your car is over fueling. My first quick look is to make sure your throttle return spring is intact and still connected. Next remove the air ducting between air cleaner box and throttle body so that you can see that the throttle plate is fully closed at start up. If OK then reinstate the temporarily removed ducting. Next I would check your fuel pressure relief (FPR) valve on the fuel line. When the engine is running remove the vacuum line attached to it and check for fuel dribbling from it or a strong smell of fuel. If the FPR is normal and healthy the engine would normally increase in revs for few seconds and then begin to idle roughly. Put your finger over the end of the disconnected vacuum line (if healthy the engine would resume normal idle after aout 5 seconds) and watch the side arm of the FPR for about two minutes. If fuel eventually spits out then change the FPR. Sometimes the diaphragm within the FPR which is acted on by engine inlet vacuum can split and the fuel behind it is sucked into the inlet plenum making the engine rev and idle roughly.
Posted on Feb 23, 2012
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Posted on Jan 02, 2017
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