Thanks, Jim. It's always passed through emissions okay. I just thought I would take the opportunity to learn something about duty cycles and Lambda, so I jumped into this string. (I hope Victor doesn't think I hijacked it.) I'll probably end up breaking something that didn't need fixed to begin with, but at least I'll learn about MAFs and duty cycles. I've never cleaned my MAF. I talked to a friend that said he cleaned his (hot-wire) on a Chevrolet. He said he actually wiped down the wire, but I'm not sure I want to go that far. Maybe regulated air to blow it off would be the safer way.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles