Quote:
Originally Posted by marylandkw
I had this problem a few years back, was interment at first and then became steady after about 300 miles (I was going to limp home but had to goto the dealer) Turned out to be a speed sensor on the back of the transmission. If I remember correctly, and I seldom do, the motor goes into a protect kinda mode when it can't sense all the things it wants too.
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I will second that.
Had that happen a few years ago on a Mack.
Speed sensor on trans output shaft failed. Speedo registered zero MPH, engine was totally devoid of power.
I would assume that without a MPH signal, the ECM thinks the truck isn't going anywhere, and wont allow the engine to receive full fuel.
Replaced the speed sensor and all was well.