Pontiac Problems? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Check for carbon build up in the throttle body bore.In some cases the carbon an cause an air flow issue coming in at idle and the idle may raise up like this here.Clean the throttle body bore and bore plate with a shop rag with some brake clean or carburetor cleaner sprayed onto the rag.Make sure you have no vacuum leaks as well on the engine.If the fault continues even though the check engine light isnt on I would have the fault codes checked using a scan tool that will plug in and communicate with all computers in your vehicle to see what codes are set.Once this is done any codes set will need diagnosed to locate and correct the fault here.If any codes are set let me know so we can continue.
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