I recently hade a problem with my 91. the Fuel Solenoid was stuck open and the truck would shut off. While i was shopping for the solenoid is was driving around 30mph when my truck opened up like the throttle was wide open. I got the truck shut off but when I tried to restart I does the same thing. The throttle cable and assambly looks to be fine.

any suggestions

 

Sorry the truck WOULDN'T shut off

 

Could this be it?

http://www.fostertruck.com/dodge/starter%20faq.htm
Q: How do bad starter contacts cause the engine to keep running when I turn off the key?

Click this for >>Dodge Ram wiring diagram << showing starter wiring.

A: The fuel shutoff solenoid is actually two solenoids in one. One coil is very strong to pull the linkage open when you hit the starter to let fuel flow. This first coil produces lots of heat and is intended for short use. The second coil is smaller and has just enough power to hold the solenoid open for running. It does not build up heat like the stronger coil.

The stronger coil is wired in with the starter so when you hit the starter the fuel solenoid opens and the engine starts. When you let the key return to the run position only the second smaller coil is needed to hold the solenoid open.

When the worn starter contacts hang and stick closed the stronger first coil stays energized along with the starter. This causes heat buildup after a short time and can actually catch fire if the battery isn't disconnected quickly.

 

Have you turned the pump up at all? Sounds like the governor is out of whack. If you turned the pump up, turn it back down some. If not, major pump work is in your future.