Davenow! My 04 forester xt. Has a turboXS BOV and rotated red turbo. List of everything else is to long. But I'm starting to think my BOV is leaking or is not closing or opening properly as I am getting a weird spike in rpms after coming out of even small boost to a stop. It revs up to 15k then down then usual spikes up and down to 22k before it settles to idle. Would u say BOV or something else?