I had a code come on not too long ago and got it checked at Advance Auto. It said something like bad EGR. All I did is clean the air filter and it hasn't come back on. The revving engine is something new though. The sulphur/ rotten egg smell has been there for awhile and seems to be getting worse. The smell starts after running the engine a bit. The smell is very noticeable.

I would like to find out what I could do to get rid of this but all I'm ever told is that the converter is going bad and soon the car may back fire due to built up pressure. Also people seem to think on here that it isn't the(a) converter but never give any info on what it could be.

Mostly I have no idea and need some expert advise.