2003 Dodge Durango Q&A

2003 Dodge Durango Question: why does my engine rev when stopped or parked

whenever im stopped with the engine running except when i first start it the engine revs between 500 and 1000 rpm. also if it sits for a while it has a hard time getting out of the first few gears. runs perfect 20mph and over. code registers an emmissons problem. bought a new gas cap MIL didnt come back on for a couple days -
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