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You won't get a definitive diagnosis without using SDS to read the adaptation, but it does sound like your Air Mass Meter is going south. Common problem on OBD-II cars, and especially on 1996- Mercedes models.
It's most likely the AMM or the fuel pressure regulator. I'd put my money on the AMM.
Here's how you tell...
1. Read the adaptations for fuel trim. If 1.15 or over, it's most likely that you need the AMM. If under .85, most likely the fuel pressure regulator.
2. If adaptation values are high, replace the AMM with a new unit and test drive the car. Recheck codes and adaptation values. If the problem is solved, voila!
3. If problem persists, then you've got to look elsewhere.
BTW, the AMM is about $300USD and take about 5 minutes to install. You'll probably have to spend some dough on diagnostic work, but it's better than throwing parts at a problem.
Keep us posted and good luck...
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