Engine vibrations

Hey guys,
Just wanted to check in and get your guys opinion on a new problem i have on my 03 3.0 Z4 (66k). I am experiencing quite a bit of engine vibrations especially under load (ie if in gear and at a red light (automatic)). My first thoughts where that there might be misfires, or a batch of bad gas so i added some octane bust and a new gas. This did not resolve the problem. Next i bought the car to a my BMW team who suggested and checked the engine mount and engine sensors for damage and errors. There where none, both the engine mounts and transmission mounts passed visual inspections; i did upgrade the car software to the newest one. Still did not fix the problem, next i changed all six spark plugs to bosh 4 tip platinum this has not resolved the problem either. Still a lot of vibrations of the engine that can be felt in the car, especially when holding on to the steering wheel. Currently the only other option i have is to replace the engine mounts to ensure 100% that they are not at fault but before i spend money on visually good looking engine mounts i wanted to get some ideas from you guys. Has anyone else had this problem, or could think of another problem that could cause this?

Thx
SyS
 
if the vibrations are felt through the steering wheel it's unlikely to be the engine

a little more info on times that it occurs would help
 
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