Not the original cat. That was one of the first things to go when I got the car 20k miles back.
Anyway, I found this thread: http://www.bonnevilleclub.com/forum/...t=sulfur+smell
And it seems like my IAT may be toast also. Guess I should have done a search before posting
Mine is black and ugly looking too so I may drop by autozone on my way to the theatre with my girlfriend and throw it in and see what happens. I think my original air box and sensor was destroyed in a wreck in the car that the motor originally came from.
Otherwise my ECM is a rebuilt delphi unit and my MAF has around 60k miles on it (as does the rest of my motor) and it has been cleaned lately.
Edit: Oh, and I've got a new (less than 3k miles) Denso O2 in it too and I regularly run Chevron Techron injector cleaner through it.