I would like to make a suggestion for you to check out: Since your catalytic converter has gotten hot enough to glow more than once, perhaps it has deteriorated internally restricting your exhaust flow. Now you have to dork with your CO adjustment to compensate for the exhaust back pressure. You might try taking the cat off to see if you still have the problem. Once you have it off, look at the webbing in the cat to see if any of it is melted or broke loose restricting exhaust flow. Walt Tampa, FL ----- Original Message ----- From: "Rustproof" <Rustproof@xxxx> > I am having some trouble locating the cause of a high idle condition (2000 rpm) and an extremely rich fuel mixture. The mixture is so rich that the catalytic converter will begin to glow. <snip>