I have a 2011 3500 6.7 Diesel that surges when truck is not under a load or being drug down. If I'm running at a constant speed it will surge just enough to notice, It will keep on doing this until I move the foot to give more throttle or decelerate. I have already changed the throttle control sensor, Fuel regulator, and the high pressure fuel sensor. I have also deleted the truck. This is what the Dodge mechanic said the original problem was so he suggested that I delete it. That did not make a difference either. if someone can help or has run into this let me know.