06-07 LBZ & LLY Duramax Powertrain
So i bought my first duramax, about 3 weeks ago, lbz, 5” straight pipe, not deleted, stock intake with top cut out (weird i know), and a 7 position switch tuner. well got it home, ran fine until i put about 400 miles on it and then it started fuel knocking. figured i had 1 or 2 going out because...