That may be a "fly by wire" throttle. Your pedal "talks" to the PCM, which
in turn opens the throttle. The two may not be communicating consistantly.
If you have traction control, that may be part of the problem.
"There are four boxes to be used in defense of liberty:
That's because your truck is, well... different :) And even so, you still
have a cable going from your pedal to your APPS - just as I do.
Cummins-powered trucks didn't go true "DBW" until '05 (hence the funky
little TV motor on the tranny, instead of the cable-actuated valve)
The 318/360 are always mechanically-controlled throttles, as they have an
actual throttle on them.
True - any stored codes might be helpful. I would think something other
than a TPS, though - even if the TPS was bad, within a short period of time
(sub-second), the MAP sensor should detect the higher pressure caused by
opening up the throttle plates, and cause the PCM to adjust the fuel
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