I have problems with my idle. After a 10-20 minute ride, when I slow down with a gear and the rpm goes nearly idle, the engine makes a 'dive' to 500rpm and if I'm lucky it goes back to 750-800. If I'm not, the car stops. The connections to the turbo are ok everything in place. I'm suspecting the bov, but is it possible for it to leak air while hot? Any ideas?