I'm having starting/running problems right now too. Though it was fixed with the installation of a new distributor cap, but "problem" returned a week or so later.

Problem is when started, engine would die immediately. Learned to heel-n-toe the accelerator pedal to keep the RPMs up between 750 and 1000. After getting on the road, the engine would (sometimes) run normally. Well, it would run fine, when moving. But, when slowed down to idle speeds, it would die most of the time, sometimes while moving, such as when backing out of a parking spot. Very frustrating! I'm getting pretty good at operating this automatic car like it has a stick shift, (going into neutral at stops, braking with the left foot, keeping the revs up at idle speed or slightly above, etc.)

Asked a fellow at work yesterday...described the symptoms...and he immediately said it was the fuel injectors. He's not a MBZ guy, but understands engines.

This is with a M103 engine. Not sure it is applicable to yours. Worth checking anyway.