Cummins n14, fuel peddle dead, changed the TPS and Harness

Had a problem like this years ago. The throttle would just go dead for awhile then come back. Long story short, it was a bad connection in the firewall canon plug. Electrical cleaner took care of it. Spent 2 days at the motel in Atlanta before they figured it out...

 

A pedal fault should give you a check engine or stop engine light. The engine responds to the pedal input so I'd look elsewhere. I'd check for a fuel restriction. You should have a compucheck fitting at the fuel pump inlet. If the filter is clean, check the fitting at the outlet of the ecm cooling plate. It's a check valve that traps debris.

 

I had a very similar problem with an ISX, the only difference was that when mine dead pedalled...it was dead with the exception of using cruise control. Had it looked at....low voltage was the error. Changed TPS, harness, had TPS calibrated, changed entire pedal...still had intermittent problems (always at the worst time...such as a traffic light or stop sign). Anyways, eventually found the problem. A wire inside the wiring harness on the side of the block had one wire which rubbed through and had one dinky little strand that would ground out on ocassion against the block. Fixed the wire and haven't looked back....been 100%. After looking back (hindsight is ALWAYS 20/20, it makes sense, because if you started off in a higher gear than you should, and the truck "shook" a little, the problem would "clear" itself....until that dinky little strand popped out through the slit in the wire loom and touched the block. Simple fix after putting in all the things the Computer suggested to. Nothing like spending a couple grand and not being any further ahead.