Sounds like an issue with the MAF to me, too, but if you've already replaced it... Have you tried cleaning the wire? There are special spray cleaners made precisely for this. The air filter is new and clean?

You must be way off on the air-fuel ratios you mentioned above. If you were squirting 50-60% fuel in there, the engine wouldn't run at all. Should be more like 8% -- 14:1 air to fuel ratio or thereabouts.

And be careful what you squirt in there. Brake cleaner can be VERY flammable. You don't wanna blow yourself up in the garage.

Cheers, John

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'98 E300TD (W210) | Sold 6/09 with 205k and counting
'04 VW Touareg V10TDI