Pump timing or air in system.
I am not familiar with this truck type, but to me this sounds like the injection timing is retarded. I do not know what type of injection system you have, but if it is the type with a mechanical pump it will be a relatively easy task to adjust the timing, but if the system is modern common rail it could be a little more tricky. The internet may give you the answer. But before you do anything, make sure the fuel system is fully bled of air, and there are no fuel leaks, as this will give the same symptoms.
Andy.
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