Awful smell from ventilation ducts

[RickDangerous]

Hi!

I have my ZR-1 and couldn't be happier and prouder but there has been an issue lately. When I accelerate and keep the speed up for a constant period of time there is strange smell coming from the vents. Apologies but it smells like wet farts. I looked under the hood, checked on liquids but everything seems fine.
It happens just when I keep a constant speed and it is really annoying. Also driving around 90mh with windows rolled down is somewhat uncomfortable.

Do you have any ideas what can it be?




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