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I cannot believe this problem is still on going for you. (One thing as a side note, I really think that a Superchips tuner is a poor choice, the SCT tuner, with tunes from Innovative Diesel is the only way to go in 6.0 performance IMO)
But I do agree with teamroper, there is a serious underlying problem here that needs to be addressed first, before money is spent on upgrades to restore "stock" power. Fuel pressure is definitely a good thing to check. Having the ability to see what the fuel pressure is, when the truck is at WOT, with a load on it may answer some questions.
I have a few questions which may have already been answered in old posts...
How does the truck start after sitting over night?
With the truck in park, or neutral, and the pedal to the floor (briefly) will the truck come up to redline?
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99 F350 XLT 4x4, Crew Cab, 19.5s, Cummins 12V powered, with a few mods, SBC DD clutch
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