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  1. 06-07 LBZ & LLY Duramax Powertrain
    I have an 07 lbz with Idaho Rob tunes on it. When I bought the truck, it had a cracked piston; I ended up swapping in another good engine. I have been experiencing a low end bog since I got it running. From a standstill, If I punch the throttle to 100% it takes to 1800-1900RPM's then takes off...