I ran into that problem a lot on the medium duty trucks with 8.1L engines. I would get a call that the truck was either low on power or the engine had died. Quite often by the time I reached the truck it would not start and run normally. It took a while to finally find the cause.
The problem was caused by abrasion on some of the wires that control the throttle assembly. Road dust will collect inside the harness loom and vibration caused by the harness resting on the inner fender will wear the wiring insulation until bare copper is exposed. In wet conditions water can cause enough of a short between wires that it will give faulty readings to the PCM. The circuits that are involved carry a maximum of 5 volts so a miner changed in voltage will cause faulty reading between the throttle assembly and the accelerator pedal assembly. It is quite common to see DTCs for either the accelerator pedal are the throttle body assembly.
The repair involves repairing the harness and repositioning the harness so that it no longer was laying on the inner fender.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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