rpms go up and down

2003 DODGE TRUCK
164,000 MILES
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CRYSTAL3733
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I have a 2003dodge 2500 hemi gas 5.7 ltr when it is I'm park the rpms go up and down and it surges what will cause it to do that ? Surges while in park
Mar 31, 2012 at 7:15 AM
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KHLOW2008
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Erratic idling are mostly caused by vacuum leakage somewhere in the intake system.
Ensure the coolant level is correct.
Mar 31, 2012 at 1:10 PM