Ok my zc smells like gas when i start up my car and sputters when warming up. My exhaust tip is blacker than always and when i drive my car it starts bogging or haveing a hard time getting past 4000 rpms but when i shift, it drives fine. I have no codes and i replaced my plugs,fuel filter, and pvc valve.

 

sounds like you may have a gas leak. is the smell inside the car or outside the car?

 

out side the car, from the exhaust tip

 

your running rich. check your FPR if you dont knwo what that is then go get an after market one and adjust it.

 

You could be having any number of problems. Use the search and try and determine what other symptoms you have. Have you done a comression test? You could be getting blow by, ur valve seals could be warn, any number of factors could make ur car seem to be running rich. Check ur timing too, could be retarded.