just got back off 200 mile trip, on interstate running 65-70, all the sudden it felt like the a/c compressor engages and i noticed no throttle response, i let off pedal got back on it and it regained power, this went on the whole trip, would never die or stall, just kept getting passed by dang fords... once i got off interstate and got in town truck performed perfectly untile i would get on 4 lane and get around 55 and noticed throttle response would go away i can floor it and nothing, let off about 3 or 4 seconds everything back to normal for about 30 seconds, she got me home so cant complain, injection pump...

 

Possible fuel filter or transfer pump below spec's. Min flow 45oz in 25 seconds pump run time. You could also have fuel tank pickup screen partially plugged.

 

Read TSB may be of some help https://www.dieseltruckresource.com/....html?t=233314

 

Sounds like you could have a Accelerator Pedal Position Sensor (APPS)problem.

That will cause "Dead Pedal" symptoms.

Any Codes?
Check Engine Light on?
What Year truck?

 

mine was just doing the same thing new vp44 and all is well. I had code o216