Strange issue started happening... it seems when i accelerate really hard my truck starts bucking when i let off the throttle. It is a 2001 7.3 diesel with a zf6 swapped in and it has custom tunes from DP-tuner. I would remove the chip to see if it does it but the chip is burnt so it overrides the automatic computer so im unsure if i can do that. It runs great when im light to moderate acceleration and also is fine when im hard accelerating right up until i back off the throttle. It only bucks once or twice then its fine but it is a pretty big jolt. Any ideas of where to start?