Cm 870 cry for help

[Lonestar10]

I hadn't seen the part about the old engine and having a new engine that they stuck the old ECM on is the new engine the same CPL as the old if it's not your old ECM might have been trying to control parts that weren't the same on the new engine as in the injectors cams and other parts might have been different on the old engine hence why your truck ran like crap.