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Surging when idles

(2002 Pontiac Sunfire)
in Martinsville, IN on April 26, 2011
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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Popular Answer
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.
on June 30, 2011
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