Customer called me yesterday asked if I could tow their truck in and see if I could figure out what's wrong with it! It's a 99 2500 2wd auto with stock 24v new lift pump and reman vp44. The truck starts and lopes hard with no throttle pedal. No engine codes. Anyone have any ideas? The vp44 was put on about 4 months ago and it's been sitting at another diesel shop for 3.5 months. I don't know where to start!