My LLY truck has been defueling randomly for a few months and haven't really had the time to check it til the other day. It usually occurs after having driven for a few minutes or even immediately after starting it some times. Basically anytime I go past around 50% throttle position it cuts the injection pulse width by 30-40%. Was wondering if my injection pump might be bad (kinda doubt since rail pressure seems fine), or if my Fuel Injection Control Module could be bad. Maybe even something going on with my tranny since I have limped it in the past. I have already replaced multiple fuel lines, added a lift pump, rebuilt filter housing, shimmed fuel rail, and changed my fuel pressure regulator.
Any thoughts?
I have attached a log of the truck doing this...