I replaced my MAF and the M104 now appears to be working properly. No flat spot or hesitation anymore! However, I should add that it is still a bit notchy and less linear in acceleration vs. the M103. In particular around 3000 RPM it appears there is a marked burst of power. Sort of reminds me of very mild turbolag. I still think the M103 is smoother, but let's face it - time to move on. At least with this M104 working properly now it is much more enjoyable!

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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