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Q: surging when idles on 2002 Pontiac Sunfire

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I have a 2002 pontiac sunfire that when it idles it surges we have replaced the altinator and the spark plugs also the idle sensor, What else could the problem be?
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Low coolant level, bad coolant temp switch, or a vacuum leak are common causes of surging idle but proper diagnostic tests need to be done to determine whats wrong.
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