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  1. 04.5-05 LLY Duramax Powertrain
    Hi all, I’ve got an 05 that limps. When I bought the thing in December it limped, and its got a new set of injectors and a new cp3 (under my ownership). My questioning is of the lift pump. The truck works mostly fine around town, I can’t do more than 75 without sending it into limp mode because...
  2. EFI Live
    My truck was tuned EFI live before I purchased. Had some work done to the vehicle( waterpump, oil cooler, high pressure fuel regulator, new glow plugs, injectors etc). Has all the mods including regeared tranny bigger turbo etc. Drove fine with all tunes until the work was done. Me being new...
  3. 911 Problems Forum
    Sorry in advance for the long post but any opinions/help would be greatly appreciated). I recently picked up a 2006 GMC Sierra 2500HD with an LBZ engine. Truck is 100% stock besides a 4” MBRP exhaust in its current state. Bought the truck needing a fuel pressure regulator because the truck was...
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