Very new to the Duramax world, but seem to have problem after problem with mine. I have recently remedied the dreaded injector harness problem and all seemed well until about an hour ago. I was driving and it seemed like either the rear end released for a split second or acted similar to a neutral drop. I was driving out of my subdivision and when it got bumpy it felt as if the rear end lifted and caused the RPMs to rise quickly and once I let of the fuel it seemed ok. Then I was driving home about 45 minutes later on the interstate and it did it again, by the time I realize what's happening it seems back to normal. Any help is greatly appreciated.