un-even idle

Hi every body,:D (Excused my English) I’m new in MB world, I sold my BMW 320d, and I bought an S/H Mercedes Benz (80K Miles - 127K Km from 2007) a C220 CDI 170HP (W204) :p– characteristics see Carfolio. I bought the car with a “little engine problem”: when the engine is cold, in...