97 Cummins Bucking Problem when In drive and reverse
 

So I have been having this problem where in idle the truck runs perfectly fine but when I put it in drive it jumps or bucks forward and in reverse it jumps or bucks backwards and if I give it gas fast then let off it dies. When driving it runs fine but when I stop at a light or stop sign it starts to jump/buck again. Anyone know what the problem is please help, thanks. Ps I’m not the most knowledgeable about engines so don’t go to techy and break it down if you can.

Hows your lift pump?

I don’t know I haven’t checked it I’ll stop by the shop I go to and have them take a look at it