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Sounds good plan to do a full fuel filter change ASAP, hoping that's what it is. Would make perfect sense though! Guess I just skipped over that part since the engine seemed to be running so good all the other times, but that makes sense when it hits the hills and goes under a load and needs...

Former deuce owner who just picked up a 91 M923a2 with the turbo Cummins in it. Drove it home from Charleston and didn't notice the problem until I started hitting hilly areas around my home state. The truck has a boost gauge and will put out 25-30 lbs of boost. When going into the bottom of a...