I forgot to add that the Exhaust shop here has a machine that checks backpressure in the exhaust and it showed that my convertors are not plugged. Its pretty neat the way it works. I had this checked because I felt that it could be a problem. The guy told me that if I dont fix the rich running condition they will plug up. He said the sulfur smell is the convertors eating the unburnt gas form the rich running engine.
Thanks for all your help
Blaze