I'm just going to replace the whole air flow meter, boot, fuel distributor, pressure regulator, and even injector lines with this complete spare unit and see what happens. Looks pretty easy, just a few bolts and some fuel lines (remember to depressurize!).

I'll post back if I'm not burned by my exploding car.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg