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No power on a mechanically sound Powerstroke engine usually means not enough fuel is getting to the cylinders. Can your scan tool get data from the IDM? If so, look at injector timing under acceleration as compared to idle. If it's about the same, then either the IDM or the PCM are not doing their job.
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You got to have the right tools to work on these things, if not it's just a guessing game. I'll opt out and reopen the question to the field hoping another expert might have a solution for you. Please don't reply until another expert responds or the site will cycle this back to me.
Welcome, I'm Chris (aka Moose) I prefer working afternoon till just after midnight.
Would you like me to try and help?
Is this power loss occurring at all speeds and gears and more rpm does not help?
Can you tell if boost pressure is being made?
Air filter clean?
Does it smoke at anytime?
Is a misfire ever felt?
When you apply throttle is there a delay in the rpms increasing or is it responding fast?
If the transmission is automatic, set the parking brake and stand on the brake pedal. In drive apply full throttle for 5 seconds, what is the max rpm reached?
The stall test confirms this is the engine to blame. All of this is pointing to the IDM not controlling the injector pulse width correct and causing the low power. Another possible cause is the accelerator pedal position sensor.
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Hello again Chris here,