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I do agree. all your numbers do indicate a lean mixture. CO is flat, HC are very low. The PCV could be a problem but you need to resolve the exhaust leak first. Fix what you know is wrong that can effect emissions readings first. Also by the way that test for pcv valve is not always accurate. I have had some rattle when in my hand and being shaken but stick when in use. Pinching the hose off during diagnosis on the machine resolved a excessive flow problem on those.
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Smoke and Fire 
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