Is the lift pump functioning ? Have you used the finger lever with the bleed screw open to see how much fuel the pomp is feeding the injection pump ? If yes, then try running it with the bleed screw loose. Often if there is an air leak before the lift pump the pump pressurizes and air locks the injection pump. If the truck runs better with the bleed screw open (it will leak a bit of fuel but thats ok) then you have an air leak on the suction side of the fuel system.
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Tdi 130 Crew Cab x2
110 V8 5 door