I have read but can't find exactly what my car is doing. I have a 2002 C320 with the same 3.2 your cars share. The car has 144k miles on it and in general runs great. The last week or so I have gotten the occasional stumble when pulling out in traffic or away from a stop sign under normal acceleration. The car has also run rough and or surged at stop on a couple of occasions. Both of these things have been very sporadic. The weird thing is that there is no check engine light on and it does illuminate when I turn the key on. The car has had a new fuel filter within the last 10k miles. Any suggestions? Clean the throttle body? Bad gas (am on my second tank since it did it the first time)?