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diagnosis help requested!
2001 7.3 stick-shift
Under heavy load (trailer) or hard acceleration, truck will shudder and lose power, like cylinders are going away one by one. It will idle rough, then smooth out after a minute or so, then run right until you load it up again. Starts and idles fine though. Sometimes the EGTs go through the roof, and sometimes its showing like 350 and dropping, as though there is no fuel at all on that side of the engine. No check engine light, and no codes. But no power either. Seems to run ok as along as I dont push it or load it up. Maybe truck is just getting lazy and doesnt want to work anymore.
I have a DPTuner, but it doesnt matter what program its in, stock etc, behaves the same.
Im thinking valve cover wiring?
Any suggestions would be appreciated.