Thank you everyone. I think I am going to first inspect the plugs/wires/connectors and then look for leaks of unmetered air through the intake. Afterwards, I will attempt to clean my MAF. If all else fails, I will break down and pick up the $250 MAF.

Anybody know if those $75 brand new units on eBay are any good? The part number through Bosch doesn't appear to be exact, but the sellers say they are for my vehicle. They even look the same. I just hate to ruin a cat or something like that. Any experience with those?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280