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Message: [QUOTE="MeTo, post: 1298834, member: 23681"] [LIST=1] [/LIST]Hello everyone, the truck is used to pull our boondock camper (~2300 pound aluminum cargo trailer) and a few hundred pounds in the back of the truck. So, it sees lots of highway miles at ~60, National Forest and BLM roads. I'm getting ~17 mpg, that's calculated by hand. The engine runs great under normal driving. When the throttle is jabbed, it will stumble or reved above 2500 rpm it will flatten out like it's starving for fuel and smoke blue quite a bit. When I let off of the throttle, it will catch itself and stop smoking. It does not smoke otherwise, does not use oil. It does not miss above 2500, it acts like it's at the rev limiter. Things I have checked: no fuel filter light, fuel tanks 3/4 full, tried switching tanks, lift pump is about 1 year old, cleaned & re-oringed fuel bowl & regulator, hpop oil is 1" from top, no oil in fuel bowl oil (black), no oil in down pipe, no visible fuel leaks, no fuel in engine oil, very little blow by & ebpv is open. I hooked my Marshal oil filled 0 to 100 psi mechanical fuel pressure gauge to the schrader port, needle swings from 48 to 72 psi continuously at all rpms. My OBDII reader showed no codes. I'm on Performance Diesel's waiting list. That could be a few weeks since Jeff was just on vacation. If it was the fuel tank shower head, selector valve or pump, the fuel light would go on. I'm thinking it might be the injectors? Could they leak high pressure oil into the cylinder? This is my first diesel, so I don't have much experience with them. This is the best I can explain it. Stats: 97 F350 XL std cab, srw, 4wd Donaldson, 3" ss down pipe & 4" 2 muffler ss exhaust Pyro & boost meters, EBPV ****** FPR shimmed & TSP 6p chip Box ****** -> custom enclosure & All synthetic lube Custom hitch & added cruise 203F t-stat Custom front deer deflector w/high lift jack My truck has 147,000 on it. It's from New Mexico and has zero rust. [/QUOTE]