Hi, my name is Eugene and I have a 01 DMAX 2500 HD. Unfortunately I’ve had a lot of problems with it, recently I just got a new DFC engine with DDP injectors and better head studs and an aftermarket exhaust manifold, plus I am on a second transmission I keep having issues with the PCM-TCM not sure, hard up/down shifts and not sure what to do now.....need help on what to do pls
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