[s-cars] Farting cats

[Aaron]

Hi Audi pros
It seems im often getting the stinky egg smell.  Otherwise car seems to
run ok.
Im not positive but I think the worst time is if I get on it after my
wife has been driving it for a few days.
Is this normal to smell after a "clean -out" session or should I be
concerned about something else.
I read the receint post regarding a missing cyl causing excess gas and
subsequent fart smell so it got me thinking...
Thanks
Aaron