P2187 audi s6 2007

Hey guys well here we are again my lovely audi s6 2007. the car has been getting p2187 now recently before it was both banks saying the same thing so I changed the Pcv and a bit later p2187 has arise alone

When I start it usually the entire thing will throw a misfire code but this time it only said cylinder 3 when I cleared the codes yesterday and drove it again today.

What I’m going to try to do is change the throttle body housing since I have another one and see if that makes a difference because I have no idea where it’s leaking I sprayed starter fluid but I’m probably going to have to smoke it if it saids the same thing after I change it

could it be the purge valve? i never changed it on the car