Hello,
In an effort to find exactly why my car is running on only 4 cylinders, I may have found at least some proof my ECU is kaput. While the engine is idling, if I turn the mixture adjustment knob on the ECU, there is absolutely no change in engine perforemance. Shouldn't there be a big change when I turn the knob from one extreme to the other? Thanks. -Mike

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1973 280SEL 4.5