Well, I'd get the other O2 back in..

Did you ever ohm out your wires?

Have you ever set your CO? How old are your fuel pumps? Have you checked your pressures?

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta