JK 3.8 Slow to return to idle

I have a nagging issue that I wanted to put out there before i dig too deep. My '08 JK with a 3.8 6-sp is slow to return to idle while shifting and/or coming to a stop. The idle will hang at about 2000 rpm for a second or two then slowly return to idle. I can't reproduce it by just revving the motor up and i only see it when shifting, slowing down or coming to a stop after driving. Once it returns to idle it stays that way unless I resume driving.

Any ideas?