2011 Silverado 5.3 six speed
 

Has anyone had a problem with unintentional acceleration with this pu. I have an intermittent problem. As I coast to a stop, the tranny drops to lower gears. Just as it drops to low gear, the engine revs and I have to apply the brake quickly and harder to stop the pu. Chev dealer has no clue. They can not replicate the problem. (intermittent) This sure gets exciting sometimes when you don't expect the engine revs. Also, the drive train is very sloppy and clunks when the engine decelerats after the suprise rev.