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Two things to check: 1) Make sure your MAF sensor is clean & working 2) I would not run anything other than NGK plugs in this engine. I see from previous posts that you have had T-belt tensioner issues. Did you replace this and the belt? are you positive your valve timing is 100% correct? All these things will cause serious performance & economy issues + you will overheat & destroy your new cat & o2 sensor if you are running excessively rich.
G/luck
Joel
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2016 Subaru Forester 2.5i base CVT
2016 Nissan Quest SV
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