I replaced the engine mounts on my W124 before memorial day weekend (what a difference!) and although I don't have any vibration, I now have a slight engine rock at idle which can be seen with the hood open or felt inside the cab (similar to the W123 rack damper bolt issue, but the W124s don't have those, IIRC). It was probably there before, but the other vibrations were so offensive it was not as noticeable.

Has anyone experienced this, and what was the resolution?

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Garage:

2017 Chevy Colorado Diesel (nanny state emissions)
2005 Volvo S40 T5 AWD, 77k
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg

WARNING: this post may contain dangerous free thinking.

Haven't had this problem, but did you change the transmission mount? I like to do all of them together.

My injectors were recently cleaned and balanced by Greazzer, that fixed all engine motion at idle for me. You have to put you hand on it to feel it moving.

Another possibility: rebuild the delivery valves.

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/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC