Question about 2000 Pontiac Grand Prix

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Starts idol rough and dies says running with rpm up let off it dies

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Your EGR valve and the air idle control valve could be dirty with carbon build up. Check the wire harness to both the EGR Valve and Air idle control valve. You can remove both of them and clean them by spraying them down with Throttle body cleaner, but your going to have to replace the gasket for them. If your lazy like i am you may get away with two cans of throttle body cleaner and spray it down the throttle body, just follow the instruction on the can and try to insert the hose from the can into the throttle body to get it past the throttle body blade. After spraying the cleaner through the throttle body, turn the engine off and let sit for 1 min. Turn the ignition key to the run position for 30 second and then turn it to the off position for 10 seconds, then start the engine and let idle for 1 min before going for a test drive to reset the base line to the air idle control valve. Good luck and hope this helps.

Posted on Jun 15, 2009

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Do you have a check engine light on? if not try cleaning the throttle body follow the tube from the air cleaner box to the throttle take hose off open throttle plate and clean with carb cleaner and a tooth brush and a rag car will run rough after you do this may have to hold throttle open to start

Posted on Jun 15, 2009

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