bulls***. I've seen a hundred times. A catalytic converter has to be totally ****** for it to cause misfires, but they will. And it doesn't matter here, because he's catless...
My point is that its a lot more likely to be caused by the O2 than the cat, for a cat to get so ****** up that it cause misfires probably dosent happens overnight. Irrelevant since hes catless anyways, I didnt see that before I posted though.
Have you seen cats causing misfires on proteges before?