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as M.B.DOC says you are running way too rich.what kind of emmissions test is run in your state?for the o2 sensor to control your mixture needs to be around 14.4 air to fuel and by the numbers yours is closer to 12.0.first lean down with 3mm ccw at the tower in front of fuel distrib until idle rough then cw a little.now you may discover why po richened the mixture.probably to cover up one or two vacuum leaks[maybe more]
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