missfire

I am trying to troubleshoot a miss in my 2003 GMC Sierra 2500HD LB7 ZF6 NP261. It has an intermittent problem at lower and higher constant speeds where it will hesitate and you can hear the clutch unload/reload. The motor was completely rebuilt 20,000KM ago. The injectors are 50,000km old and...

Lmm duramax, 258k miles had had one injector replaced, I just put a brand new turbo on it and a hsp egr delete and new y bridge, noticed after I got everything back together and running that the truck has a white haze and a small misfire on first start, it’s worse on cold mornings but it’s...

hey everybody. i recently got this dmax lb7 and i was told that the injectors were replaced around 20000 miles ago. it is a retired formans truck from a local company here near me. anyways, i noticed a knock upon crusing speeds, so i took it the the dealership in hopes of getting new...