I don't believe it's the catalytic converter, in my experience with those if they become clogged your vehicle with go as slow as a turtle(zero acceleration).
+ Spittin and sputtering at idle usually. Imagine if you will your v6 on2 cylinders, this is what it sounds and feels like
Originally Posted by AmericanSoldier
...not scanning/monitoring your motor is like bangin a hooker and you just HOPE your not infected.