Rod check this out:
My car's exhaust smells like rotten eggs - Delphi FAQ

www.delphifaq.com/faq/f1188.shtml


My car's exhaus smells like rotten eggs when I start it up in the morning. Why is that ... is usually noticed after a cold start, fast idle, extended periods of idling and full throttle acceleration. ... Replacing the catalytic converter will not eliminate sulfur smell and ... Strong sulfur smell means that you are running a rich air/fuel rat

Running rich can cause the smell and changing the converter will not change that if indeed you are rich. Still trying to dial it in AFR wise? It was tough for me and time consuming as the regulator gets more sensitive as you get a finer tune/AFR. Mark