95 cummins (surging)
 

Hey new to the 12 valve circle.I have a 95 Dodge 4x4 5spd.At shifting rpms pulling a load,the truck starts to buck uncontrolably.If I shift under lag it doesnt do it.It has 4 hole injectors not sure of size just bought the truck.New clutch,lift pump seems to be fine.I dont know if the pump has been turned up?Need help badly thanks

is the spring strong enuff on the throttle? had one that would do this and the big spring broke.

I think so. Had a couple guys look at and drove it,couldnt find anything out of the ordinary.