I had already written a long text and described in detail what was going on with me. Unfortunately this text was then completely deleted by an unconceivable touch of the mobile phone. Therefore here very briefly. I had problems with vibration in idling up to about 2000 rpm. (525d N47) At first I left the engine bearings, which brought only limited success. These motor bearings were from the accessories. A familiar thought that maybe the original bearings would be better because the Zubeh At the same time, the suction bridge was removed for cleaning purposes. It was discovered that a throttle valve was loose in the intake channel. After the intermediate plate with the throttle valves was replaced, the engine runs again as it should be. Whether the cause of the vibration in the engine bearings or the throttle valve lay I am not sure, of course, but I strongly suspect the flaps.