I have a 97 12v completely stock. The truck sometimes looses power, almost a dead pedal. If you pull over, shut the truck off and restart, the power is back and will be fine from 15 min- 15 weeks. It only happens on the highway about 7omph. I have replaced the shut off solenoid and the relay assembly. The in tank sending unit has been replaced and fuel filters have been replaced and are clean every time. I have 24v and don't know a whole lot about the 12v's. Any help or suggestions would be greatly appreciated.