I drive a 2001 dodge 2500 cummins, when id drive the truck it would have a surging feel while going up hills, accelerating, and my transmission would drop out of gear at highway speeds with no throttle response. The issue has to do with the torque converter, not know when to lock and unlock. Its due to a signal interference by the alternator. Ive tried all the methods on youtube, and the forums. They didnt work. This fixed the issue completely for me