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Intermittent My 2005 toyota corolla, runs smoothly. but, sometimes suddenly the engines idling becomes rough and seems the engine will shut off. please help. thanks a lot

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Pull the spark plug wires out one by one and check for oil on wire. Sometimes the valve cover spark plug hole gaskets leak oil into the spark plug hole and causes a misfire. If oil found clean with brake or carb cleaner and blow out with compressed air. also when car runs bad listen under hood for snapping noise this would be spark escaping to ground somewere. In a dark garage you might be able to see the spark.

Posted on Mar 04, 2009

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