If this happens when you lay off the gas while driving then it could be the IAC.
The IAC (Idle Air Control) Sensor. My Dodge did the same thing and by either cleaning the IAC or replacing the IAC did the trick. I found a video for you on Youtube on how to replace it. The IAC is on the backside of the throttle body and only takes minutes to do. Mine was loaded with carbon and locked up.
http://www.youtube.com/watch?v=5yStBpngvbs
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