Sounds like a broken motor mount to me...
is where I got my Haynes manual for my W124...I don't remember the link though...do a web search.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car