I am going to try and clean or posssibly buy another TPS - but I'm not sure where it's at. Is it the black square box next to the inj. pump, with the wires off of the right side?

Also - Cummins can't tell me for sure that they have a TPS for it. They gave me a part # of 3970084 - which is a control gear shift. Is this the correct Cummins part #?

This is for a '99 24V - automatic.

 

I believe so. I think it is a called an Acceleration Pedal Position Sensor, instead of a Throttle Position Sensor on your truck. Of course, if this is incorrect information, I'm sure someone will be along to correct me shortly
An APPS runs between $300 and $400, at least that's the quotes I got when I thought that was my problem.

P.S. I posted to you also in your other thread "Loss of Power". It's pretty funny that was the exact title of my thread!!!!