So in my shop I have a 2013 5500 that came in low power until 2,000 rpm tons of black smoke then little spurts while powering and at cruise. Also all with a nasty vibration at idle and a possible fuel knock. 210k on the mileage. Last shop did fuel filters, 6 new Bosch injectors, valve cover gasket. NO CODES truck has been deleted probably many moons ago. No boost leaks, turbo is actuating, diesel is diesel, air box is good and so is the filter. On my snap on I cannot find what they named the fuel pressure regulator on the cp3 rail pressure at idle kinda sticks with the commanded. Haven’t Drained the oil yet. Was looking into either a cp3 or the pressure relief on the front of the rail. Any additional advice would be amazing and appreciated. We are generally a ford shop have toyed minimal with the dodges and their high pressure fuel systems.