Well one air-flow meter later and the car seems to be behaving again. The inside of the potentiometer was badly corroded with rust. The mechanic accused the high pressure engine washers but I have never done this to the car. It did however look like water had gotten in there.

Thanks to Steve and Donnie for their help. Now I plan to put back the old ECU and see if anything changes. I doubt it will.

Any ideas on how to approach the dealer who spent alot of my money and didn't fix this? I'm thinking I will first write to the dealership and see what they do, if I am unsatisfied with their response I plan to write to the local MB rep and possibly the BBB.

Thanks again!
Garth

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Garth Gillespie
87 300E
92 Audi 100CS Quattro