Are there DIY tests for the MAF? I know with some asian cars I have owned in the past (Hyundai, Honda, GEO Metro) you could pull the MAF and perform some tests with a multimeter to verify that it was either out of spec or marginal before spending money on a replacement.

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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