Thumping feeling when decelerating 2007 Sebring 3.5 liter
 

Hello. I have a 2007 Sebring with a 3.5 liter V6 engine. When I let go of the gas (decelerate) from approximately 35 miles per hour I "feel" the car thumping under my feet. Does anyone have any ideas what this may be?
Thank you.

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