Well yes, that is a lot more conclusive. Bad engine mounts can cause mis-fire type symptoms. With that engine you are supposed to also reset the rotor adaptation data after replacing engine mounts. Directly related to CPS function. I'm pretty sure you need the MB software to do so.

Also, when you have abnormal engine noises/vibration with that engine, keep a close eye on the front crank pulley. Watch it while the engine is running and make sure it turns true and is not wobbling.