Please some help #LowRevIdle

[RobertKng]

Hello so I have an mb clk w208 2.0 kompressor 192hp and I want to ask you for some advices so my problem is that when I start the car it revs around 200 RPM for like 20 seconds then ramaine around 100 RPM and usully goes below around 50 and start shaking quite rough, and this morning I was driving foot steel 200 RPM then goes real fast at 230 while I had the foot still on acceleration. I tried to clean to clean the trothle valve and reseting the electronic idle acceleration without resolve. I'am sorry for any misspeling, I tried to explain the best that I can my problem.