The reason why it is vibrating is cause of the Engine
Mounts.
You have to get the Engine Mounting changed !
cheers.
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Try this dont listen to people who say to old or get it for free
when its not.. Here is a truly free sdchematic with stereos also
http://mercedes-benz-club.org/forum/manuals/w126/Mercedes_300SE_1991.pdf
If you want to know something ask ME
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Mercedes Benz makes Mercedes Benz cars. Mercedes Benz is a
division of the German company Daimler.