Engine wants to stall
 

I just got a 94 12 valve with 259xxx miles. I can tell the truck needs a clutch goin up hills but just cruising at lower rpms it starts to shake and act like it wants to stall. I have ddp 140hp injectors and #100 fuel plate. The exhaust is stock until it gets to the turn up for the stack. I didnt know if maybe my injection pump needs work or if the clutch was the problem. New to diesels need some input.

almost like ur in to high if a gear?

To low of a rpm? What does it idle at?

When does it do this? Does it do it if you are cruising and leave it all in gear and just let off the pedal? When you let off the governor pulls the rack back and basically cuts off fuel and would tell you if it has to do with injectors or something.

it does it at cruising not at idle. It seems like its in to high of gear idk what would be to low of rpm for each gear im used to gas.