The smell is coming from the exhaust pipe and the car runs and idles rough. There's definitely a strong sulfur smell coming from the exhaust pipe. Everything I've read indicates that it's O2 sensors and cylinder misfire. What damage am I doing by driving it?

Advance Auto told me that I have codes P0455 and P0305 with a cylinder misfire in #4. How much can the cat converter take before it's damaged? Can any of this be caused by the fuel pump issues I've been having?

Thank you for getting back to me...I am sure that the dealership is covering something up...I just can't prove it. Speaking of smell, when I drove it last, there was a "firework-like", smokey smell coming out. Any idea of what that might be?

I am having issues with my car starting since having the fuel pump replaced due to the recall. I have taken it back to the dealer on 4 occasions and they have told me that it was part of the adjustment process (x2) and then it was due to an oil leak (repaired) and then finally, oxygen sensors. Needl...