Ups mech

Thx I will try this

Yes we have updated tech tool . Fuel pressure good. Passes all test. No faults. All green lights.

I'm working on a 2014 Mack pinnacle  we are having regen problems cannot get exh temp high enough only  get to 300 deg. We replaced pdf  filter doser injector dower module and air pressure regulator and air dryer  and fuel filters. Mack said dryer when old  has particles in air and harms dower module. No codes active or inactive. All test passed. No exh leaks. When in regen mode engine starts to stumble  when coolant temp reaches 175 deg. When at idle engine idles smooth. But when you press the throttle  it sounds like the engine is loaded up then smokes then clears out. Anyone have any suggestion.