Have it scanned. There might be codes in there. I recall a similar problem on a 95 C280. The car did it only once during hard driving and no matter what I did I couldn't duplicate the problem. However, the computer stored an EGR valve fault. I checked the EGR valve and it was fine. I am still puzzled as to what exactly happened.

BTW, I would double check plugs for fouling.

Vin