I had to have two inj. put in and the rest were cleaned and the replaced the HP pump and cleaned the fuel rail. I have been driving the truck a week to day after getting it from the dealer for repairs. But now theres a stumble just as you take off and a good size puff of black smoke. Here's the funny part, you can here it getting ready to do it because you can not hear the motor at the air intake. It goes quit you get the smoke then you here the motor again. It almost sounds like it's starving for air but it's not, the filter is clean.