jumps in reverse

[haakon]

my 1999 suburban 6.5td sometimes sounds like its dying if put in reverse and pushing the throttle slightly,if i pull it a little harder,its ok..
its worst when its worm,new converter in it..any ideas?

 

[3500GMC]

Could be clutch slippage. What's you fluid look like?

 

[haakon]

the fluid is ok,it sounds like the engine dies but when i let go off the throttle the engine jumps and throw little black smoke...
if i reverse and push the throttle a little more its ok..

 

[3500GMC]

Reverse only? Wondering if you might have some IP issues?

 

[haakon]

reverse only,maby should adjust the ip a little bit? give it a little more fuel?

 

[haakon]

I belive its the lock up engaging in reverse,forward its ok..