Brian,
Ryan gave you about the same advice I would have. Removing and reinstalling the MAS might have cleaned the contacts, but I'm betting one of your two fuel pumps in going South. This is a common problem on Mercedes of this era. The most dreaded word in a mechanics dictionary comes into play here. That word is INTERMITTENT. These pumps play that game. I also had an EZL module play that game a few weeks ago. It drove me nuts. The car would crap out on the road and be fine when it got to the shop. Good luck.

Peter

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