SOURCE: Fuel Problem
fuel pressure regulator? This diverts excess pressure from the rail back to the tank. When they wear out they usually stay stuck open thus diverting all pressure back to the tank. Pressure tests do not reveal this as pressure is checked before the rail not in it. I do believe you have a bad fuel regulator. They are 75US ouch.
SOURCE: runs when cold, stalls when hot
Have you tried changing your fuel filter. Not saying that is what it is but when you first start your truck it runs good and the longer it runs the more your fuel pressure drops. It is possible that the longer it runs the more trash the filter is picking up and begins to stall but when you turn the truck off the sediment in the filter settles allowing the truck to restart.
SOURCE: 1997 F-350 Ford Powerstroke4x4 Crew
Have you changed your oil? Rotella 15W-40. These engines really don't like old oil. It becomes too thick for the injection pump to work correctly. Another possibility is a bad cam sensor on the front of the motor. Most engines call this the crank sensor but on this engine you have to look it up as a cam sensor.
SOURCE: stalls when I slow down. stalls when I start it
first make sure all the engine breather hoses are clear and does your brake servo hold vacuum after the car has been parked for a few hours (pump thhe pedal and you should feel it begin to go more solid each time it is depressed
Engine stalls or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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