Tslaney

What component in the trans could cause this issue? And what tests can I do diagnose that component? It happens in park and neutral aswell.

I really don't think it's fuel related but it is possible. It has loads of power and is not smoking, doesn't sound like it's starving for fuel. It pulls great and just falls right to idle at the snap of a finger. I'm going to try and piece together a gauge to measure my fuel pressure today but I don't think I will find an issue there. i will check the grounds aswell.

Hi guys, i have a 2003 cummins auto trans that I am having dead pedal issues. No codes. While driving at completely random times the truck will completely drop off to idle for a couple seconds, then come back to the desired rpm and work fine. Sometimes this happens very rapidly and makes the truck undriveable. On the rare occasion that the truck does not act up it runs perfectly fine with plenty of power. I replaced the APPS and it made no difference. Checked continuity on harness from each of the 6 wires from the apps to the ecu connector, all OK, checked continuity from ecu connector to FCA and found OK, checked continuity from each pin in the ecu connector to all other pins and ground, found OK aswell. I have a good 5v signal voltage to the APPS and checked resistance on return side of circuit from APPS connector to battery ground with the key off and found 1 ohm. Signal voltage from APPS to ECU checks out OK as APPS cycles through its range of travel, even when the pedal goes dead. While monitoring absolute throttle position % with scan tool, throttle position reads fine, even when the pedal goes dead. I also removed the FCA and cleaned it with wd40 and reinstalled. I am thinking there may be an ecm issue but I'm am not sure of any other testing I can do to make an accurate diagnosis, I've been trying to get my hands on a known good ecm locally but I can't seem to find one. Any suggestions on where to go next?