Do you have any codes is the MIL light on. It is possible you have a problem with the elctronic govenor assembly.
This symptom is associated with a code 638.
What happens is the gears in the trottle assembly get stripped out. The TPS and the FPP end up 20% or greater difference in voltage and the ECU shuts the engine down
You can blink the codes out by jumping A-D you will see each code 3 times and the codes are 3 didgets not 2. The connector is located down by the ECU
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