At 01:39 PM 4/16/2007, Jeff Stewart wrote...
>fine again. I'm beginning to believe my original crappy gas theory.
>Question-could crappy gas have caused the meltdown of the cat?

Yes. Misfiring from bad gas can result in unburned gas making its way
to the cat. Too much unburned gas in the cat will overheat it, causing
a meltdown.

But you said you had performance problems before the fillup. Maybe
you're running on 3 cylinders? (fouled plug, bad ignition wire, bad
valve, head leak, ???)