Hi, so my Merc seems to have problems that I can’t diagnose, I searched through the forums and couldn’t find anything similar. I have a 2003 c220 cdi with 105kw. So what happens is when I put it in gear and start to let go of clutch slowly, the rpm drops to 400/500rpm and comes back to idle rpm and alot of black smoke comes out. I recreated it by engaging the park brake and lifting off clutch slowly until it kinda wanted to go. It also stutters and jumps when I’m driving in first, second or third gear from 1000 to 2000 rpm until it picks up, usually when I’m driving in city. Hard stutter happens if I drive it at a steady speed and rpm and then press the pedal (I nearly broke my nose on the steering wheel one time lol)

So far I changed MAF sensor twice, fuel pump, Rail Pressure Sensor(was faulty), all 4 Injectors, fuel lines and fuel filter. Nothing comes up on diag and I really don’t know what to do anymore.