Been working on this issue for quite sometime now . When the truck starts it idles roughly but will smooth out around 2 grand. When the engine is under load it will not have any power, it spits, and sputters, when I let off the gas it dies. It will go into passing gear but no acceleration or power. It basically falls on its ***.

List of replaced parts replaced:

Tranny serviced (actually rebuilt it)
Fuel Pump
TPS
distributor and internal components (they came with the new distributor)
Timing chain and gears (was slapping the side of the block lol)
Plugs
wires
cap and rotor

Fixing to replace

EGR Valve
MAP sensor
O2 sensor
Vacuum lines

I really have no clue what the issue is with this truck I have worked on trucks for a long time now and never ran into this. It isnt throwing anymore codes at me. I checked the injectors and they are fine too. I am looking into a total new exhaust as well. Any suggestions would be appreciated. I really feel like shooting the thing

 

You say fuel pump but don't mention a fuel filter. Did you do that?

 

Yes I did, I apologize for not mentioning that.

 

Computer or distributor issue? Maybe check the timing and timing advance. I bought a 90 that used to jerk around and constant speed and a mechanic thought It was the trans. Ended up being the computer kept dropping time on me