Ok I need help. My merc C220d w203 is having a proble it feels and looks like a misfire. It happen constant when I rev above 2000rpm to 3000rpm. Once the engine drops back to idle it take it from 5 seconds to a 60 seconds but it gets its self back under control and stops misfiring. While it is misfiring loads of white/Blue smoke comes out. And it stinks of unburnt desiel fuel.
I have plugged in a code reader there are zero codes and no EML. I'm not sure what could be causing it, it just started out of the blue this morning