I have a 2000 Sable with the Duratec engine. After the vehicle is warm, if I shut it off for a half hour or so, I get a blast of fuel odor when I start it up again. I have looked for fuel leaks and cannot seem to find any. Also, twice now, I've received a miss fire code for cyl. #6. Both times it had happened, it rained the day before. Has anyone else had these problems?