2002 Acura TL Q&A

2002 Acura TL Question: missfire an all clylinders,replaced plugs cleaned plenum and ports,no vac leaks

curious why is TCS light on also? found exhaust leak behind coverter, would that cause a problem with the upper stream 02 senser? or a leak in the valve cover gasget did find abit of oil in that area upon doing plenum. please help thank you so much -
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