have you tried reseting the " pedal " ?
turn the key on , but don't start it .
slowly depress the pedal to the floor , then slowly release it .
turn the key off
start the truck and see is anything has changed .
hope this helps .....
pulled this directly from "blue chips" site ;
http://www.bluechipdiesel.com/vp44diagnostichelp.html"This is THE MOST COMMON DRIVABILITY COMPLAINT and is an intermittent one that happens most often when the truck is hot or working harder, but can occur much less frequently when cold too. There are no codes pertaining to “Dead Pedal” that will condemn the computer and therefore the VP44. This symptom of “Dead Pedal” is rarely caused by a faulty APPS (Accelerator Pedal Position Sensor) and 99% of the time it is caused by a faulty computer on the top of VP44 injection pump. These numbers are NOT an exaggeration. The best way to positively eliminate or condemn the APPS as the cause of the problem is to “scan" or read the ECM (not the PCM) in your truck to check for any DTC codes pertaining to the APPS, such as a 121 or 122. IF YOU DON’T GET THESE CODES YOU DON’T NEED AN APPS AND IF YOU HAVE DEAD PEDAL, cold or hot, YOU DO NEED A VP44! NO MORE DIAGNOSIS NECESSARY.
If you have a 2000 – 2002 truck you can get the codes by turning the ignition switch to the on position 3 times within 5 seconds and leave it in the on position and stare at the odometer. Write down the information you get and use it for your diagnosis. You can tell what computer you are reading by the number of the code(s) you get. If it pertains to the engine or fueling, then it is the ECM and if it pertains to the rest of the truck it is the PCM. If you get a 1693 that tells you there is at least one code in the other computer. If you have a 1998-99 or a grumpy 2000 this will not work, so you’ll have to get the codes with a scan tool. Most auto parts stores will do this for free for you. A possible pitfall here is if someone turned the key on when the APPS plug was disconnected. This will set an APPS code, so if you think this could have happened, clear all the codes with a scanner, recheck for codes to be sure all codes were cleared, then drive the truck until the dead pedal symptom reoccurs and then check to see if the APPS code returns. The worst case scenario is when you replace the APPS because of the code(s) and it doesn’t solve ALL your drivability issues. Then you have a bad VP44 as well.
If you don’t have access to a scan tool, and want to trust my experience, let me explain the difference in symptoms between a bad APPS and a bad computer on the injection pump. A bad APPS usually is just a flat spot at a certain throttle opening, usually 65-70 MPH, and smacking the pedal to the floor a few times, usually clears it up. If pushing the throttle just a bit more makes it take off, or if going back to a lesser throttle opening makes the engine run fine, then it is a bad APPS. This usually occurs most frequently, but not always, in cold and or wet conditions.
If it is caused by the computer, the “Dead Pedal” occurs at all throttle positions and the computer will only reset and play again if you let the pedal go to idle for a brief time and reestablish “Idle Validation”, or push the clutch in, or shut off and restart the engine, or just wait. The “Dead Pedal” happens most often when hot or towing, but sometimes occurs right after start up when cold"
'93 w250 .... stock ...
curently removing the dead moose parts ....