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Vacuum leak is one cause.

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Another possible cause may be a bad Idle Air Control Valve (IAC Valve).

Your car should Idle, once the engine is at operating temperature, between 680-750 RPM. If the engine idles below this range with no appliances on, i.e. Air Conditioning, Fan or Window Heat, then your IAC Valve may have gone bad.

SUBMITED: Friday, 03JUN11

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14y ago

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