How to get started on clean running engine

[DonnyDumpTruck]

My truck is a T800 . I put a 15ft dump bed on it. The engine started showing problems as soon as i drove it home. Been to dealershits spent lots of money turbo , dpf,egr cooler they got me good. Ended up being drop liner. I couldnt trust the dearlships around here . So i took it to a independent repair shop . Bought all new parts on the engine pretty much everything new but injectors. Had cummings do the couter bore and they told me they set it at 13. I really hopeing this shop got it right. I run 3,000 miles no problems yet.