Clk CDI 270 w209 rough idle at start

Hi guys i'm new to the forum , so i have a clk w209 cdi 270 and lately the car has rough idle at start but when i accelerate a bit (car on neutral) the rough idle dies and the engine works smoothly !!! Any idea what's the problem ? Thanks in advance.

Hi guys i'm new to the forum , so i have a clk w209 cdi 270 and lately the car has rough idle at start but when i accelerate a bit (car on neutral) the rough idle dies and the engine works smoothly !!! Any idea what's the problem ?
Thanks in advance.

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