Waste of time at this point. You don't need a 'Crossfire expert', you need those damn codes.

Sounds to me like a coil pack has, perhaps, failed. That, or an injector has failed OR you have crappy gas in there.

OR that you have low fuel pressure.


ANY competent car guy can get to the bottom of this. For what you are talking about, my local garage can handle it. BUT, it would not be a bad idea to find some garage that is known for Mercedes knowledge.