So i tried this.

Supported the transmission and drive train with a jack while car on flat ground. loosened bolts holding the transmission mount to the cross member, and the cross member bolts. then tightened the transmission mount bolts first, then cross member bolts.

it idles better, but still with some vibration with AC on and while in gear only..
less than before though..

did i miss something? what bolts to loosen/ tighten first?

thanks,

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1993 300E, 2.8 M104 .....