I have a 96 c280 in which I've recently noticed when I brake to a stop, the last moments before coming to a complete stop there is a very slight but definite pulsating (couple to 3 times maybe) or maintaining of the rpms before dropping to the final idle speed.

This occurs as during the 700 to 550 rpm range (or the last 100 or so rpms before idle.

Once it reaches the idle, there is no fluctuation of the idle and is very stable. I don't notice any other drivability problems.

The MAS was replaced a year ago when there was a an extremely erratic idle which cured that problem, but have only noticed this problem recently.

I've read some of the posts about vacuum problems but in trying to analyze the symptoms, it almost seems as if there is a delay in totally releasing the transmission as I come to a stop. Could it be a torque convertor situation? ATF level situation? Once at a complete stop, everything is normal, the usual MB creeping forward.