Mercedes Benz C180 Auto Kompressor 2002, problem with slight vibration and shudder when coming to a stop. This only happens below 1000rpm on the rev counter. It looks like the revs jumps slightly when below 1000rpm and just before it idles, there is a slight shudder and it can be felt just before the idling settles. The shudder is not felt on the steering but on on the whole car slightly.Even if you do not brake and the revs drop below 1000rpms it also gives a slight shudder/vibration like it wants to cut off and then stabilizes again quickly.

It feels like on a manual car when the wrong gear is selected and it wants to cut off. Please help with diagnosing this issue as merc dealer put the car on the machine and ran diagnostics and no fault was found.