I have a 1993 Chevy 3500, 6.5 turbo diesel, that shifts hard going into first,second, and third, and then it will not shift into fourth. We used to be able to put the truck into neutral and shut it off while driving, turn it back on then it would shift. We cant figure out what is wrong.
Answer:
This sounds like the throttle position sensor on the side of the injection pump. Can you get any codes out of the computer?
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