rough idle need help.
 

My car is a 1985 190d 2.2. When the motor is warmed up it has a very rough idle that gets real bad in park but is also noticible in drive I think the load on the motor calms the idle down. The car has new motor mounts. I also wanted to say cool web site. I bought this car about 1 month ago I am not new to diesels new to mercedes though. There is also a new fuel filter as far as the big one the small one I will change soon. Any help would be great Thanks