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Power loss during boost

Fuel System

Vehicle Information: Year: 1987; Engine (Size, Modifications): 3.3L (headers and exhaust replaced); Total Mileage: 64000;

My 1987 930 loses power when on boost at about 2/3 throttle. Power comes back at full throttle. The problem also goes away when I disconnect the Oxygen sensor, so I presume the problem lies with one of the components in the lambda circuit. I have replaced the oxygen sensor and the new sensor appears to be working (the voltage at the oxygen sensor lead is in the right range). Is there a way to tell whether the frequency valve or the lamda control unit might be defective? Are there other components in the lambda circuit that should be checked?

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