Hi i'm new to the forum, i have a 92 coup deville with 73,ooo miles ,it runs well when driveing but idels a little rough and as a bad smell (like rotten eggs) what can that be.Thanks Sev



=================

mod edit
title and location

 

the smell could be attributed to bad catylitic converter or pcv valve.

 

Also check for vacuum leaks. Is service soon or now lights on ? Check for E codes and post.