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Lately my car has been giving me this problem. When I turn the car on it will idle fine for about a minute than the RPM needle will gradually start to fluctuate between 500-1000 RPM. Almost as if I was tapping the gas and than letting go repeatedly. Does anyone have any idea what this could be. I know my alternator is making a noise but my mechanic said that it is the bearing on it and that it would be fine. Please help. http://photo.msn.s8.com/MS8zLzAvMS8...mGjGr42PEBrXAI96H0k61OlPBLRx613jNqtE$/jpg.jpg
 

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It is misfiring try to check the timing and do a tune-up.

Anthony
 

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Start by checking for air in the cooling system --- the infamous hairline radiator top tank crack. Clean the Throttle Body. Do this and report back. Could also be fast idle valve, electronic air control valve, or even idle adjustment out of spec. This list is not inclusive, but is a start.
 
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