My 6.2L stalls when I let off the gas pedal...Help..Please.
 

So the history goes something like this,
84' K20 4x4 N/A 6.2L diesel, My baby. Donor vehicle is a 82' 6.2L 4x2 that has been " rebuilt " 2 1/2 yrs ago.
I pulled my motor and replaced w/ the rebuilt.
She sounds strong and I even drove her around yesterday, a bit.
Problem is when I let off the gas pedal she stalls.
When I ease off the gas pedal she will NOT stall.
Any help would be greatly appreciated.\
Whole job took me about 20 hrs...no book, no manual, and with very little help.
I am a residential contractor that found myself taking on the projct my self....learned alot and I am a lot closer to my burban.
Thanks

Need to raise the idle rpm a little bit.

Raise the Idle up a bit......
 

I turned it 1/4 over ......1/4 under .....full over and a full under no change other than not being able to start the truck.
Fuel filter?
??/??

Does it seem to idle ok?? It doesn't idle normally, then take off on it's own, then almost kill itself from too low an rpm??

Idles great...sounds great...but if I rev the engine and let off too quickly then she stalls.
I have replaced fuel filter and ....no change. If i am gentle on deceleration she is good, but if I gas it and let of she will die..........not a clue on what is going on other than throw her to a qualified mechanic.....this project has been an endeavor, now I would like to reap the fruits of my labours.

Does it fire right up every morning, or does it crank for a bit before it starts?? Also, check and see if there is power to the other set of wires on the injection pump (be 2 small green wires). If there isn't any power, run a jumper from the fuel cutoff.

Fires right up and the idle is up and down for a couple of minutes untill she warms up.
I do believe I know the two wires in reference. I will check today...thanks again for you time and assistance!!!!
:rocking:

Not a problem. :c:

Guess I will be getting fuel additives and water seperator tomorrow and see if that fixes the problem.
She was shifting late yesterday...I will see if there is any change tomorrow when I go get the additives( recommended by Mechanic friend) otherwise might have to hand it over to a certified mechanic...don"t want to!!
:s:
Oh well...onward and upward!!!!!

good luck