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Hi, just bought an 03.5 6.0 King Ranch CC truck. Livewire tuner with WDI custom tunes, 30 over injectors, KC stage 3 turbo, some other goodies. It has one issue. No check engine light, but for some reason, no matter what tune it’s in, after it warms up it acts like it’s down a cylinder. I’m not too versed with diesels yet so I don’t even know where to start. I’ll drive maybe a half mile then it wants to idle down and act like it loses half its power. It actually shut off completely once at a red light, but started back up and ran with no issue. I can’t understand what it could be. Maybe someone can give me some insight?
 
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