<img src="/forums/images/graemlins/zombie.gif" alt="" />My truck just failed emmissions test. it had too much Carbon Monoxide, CO.

The hydrocardons, HC are within specs. So are the Oxides of Nitrogen, NOx.

I just fixed a hell of a misfire (burned exhasut valve) I had a gas analizer hooked up to it before the repair ans HC readings were as if i took it from the reading from the gas tank.
I am wondering if all this time all that gas could have damaged the cat????
does anyone have any ideas???? <img src="/forums/images/graemlins/zombie.gif" alt="" />