surging when idles on 2002 Pontiac Sunfire

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?

Asked by for the 2002 Pontiac Sunfire
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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.