Ok, hopefully this is my last one haha. I don't know if this is normal but right when I turn off the car the engine or somewhere in the engine bay u hear a psss noise like pressure being released but it's only for a second. Wondering if that's a problem or normal and if anyone knows wat that is.

 

its your throttle body letting off the pressure

 

Mine does the same thing, it's you're CD player that's still spinning until you open the door then it stops. I thought the same thing as you did.