I have a 96 5.9, to start from the beginning truck was fine only issue I had was sometimes you’d have to hit the gas when cranking up to get it to run. Driveshaft fell out and when it did ripped 4 wires out from the bottom, We took it took the shop & had it fixed. They also replaced “ecm”, u joint and yolk. 4k just for that. Then we had to tow it home, come to find out transfer case , & transmission was out so we replaced those. We’ve replaced Crankshaft sensor,camshaft sensor, pickup, tps, coil, cap, rotor, fuel regulator sensor, checked spark plugs, checked injectors, cleaned IAC valve, cleaned throttle bottle, changed the oil and filter. Now it will crank but idols rough in drive it’s like it loses power trying to accelerate. Will go into reverse and move no problem only a little bit rough idol. We have tried everything we can think of, we probably have replaced more than what I listed but that’s all I can think of right now. Open to any suggestions or ideas
also to add- when in drive the rpm gauge goes up and down then shuts off, and stalls but cranks right back up every time

 

Why did they replace the ECM???

Recheck firing order. Given the location of the distributor, it's easy to misplace a wire or two.

 

I am not sure, they did a ECM repair kit. I did just notice both coolant temperature control sensors are bad. Headed to parts store now to replace those. It’s got to be some sort of sensor or something like that, I’m just completely lost. I’ve put over 7k into and it still won’t run right

 

How did you notice that? You can check codes by using the key dance. One is for the temp gauge and the other is for the pcm.

 

I just so happened to check them both and both need replacement…They were both corroded.
I then got a code for it, now I’m getting “po122 throttle / pedal position sensor/ switch a circuit low “
I’ve replaced the TPS not sure what that could be…

 

P0122 Throttle Position Sensor #1 Voltage Low
Did you replace the tps before or after you got the code? Did you clear it?

 

it’s throwing that and saying same thing but throttle high on my code reader. Truck “key dance” has thrown a couple as well all saying either multiple misfire or Injector Circuit Malfunction. I replaced the TPS again, no luck. It’s like chocked up or something. I’m not sure, fuel pump is fine, battery is new. I’m not even sure what else to do, could it maybe be electrical issue? It cranks up every time, if you stay on the gas for a second it will stay running and sorta clear up. But when you put it in drive still put puts. I’m willing to try anything to fix it, I just don’t know what else to replace at this point. Maybe timing is off??

 

Check your pcv valve, They can stick open and cause issues. Was the plenum gasket ever done? What is the code #'s are you getting? After you change a part that threw a code you need to clear it. It won't go away on it's own. You may want to try resetting the pcm, Disconnect the battery overnight or touch the terminals together. This will clear the pcm and it will "relearn" the components.

 

For what it is worth. It is a long thread but, this is an issue I had and how the forum helped me fix it.
Electronics Electrical Nightmare Help Me - DodgeForum.com

 

I will check that, and will check codes again. We’ve cleared them