I had a rough idle. Had the valves set, put a national carb. Remanufactured carb on it and run pure gas no ethanol and problem is gone.
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Clean your mass flow sensor in intake air supply. That is the problem not oxygen sensor. Go to autozone and purchase specific cleaner for mass flow sensor. Take two screws out lift it out and do it carefully as new sensor is about 300 dollars.. That will fix problem. Oil and grime on sensor...