So since I bought my car 6 years ago I have had a bad BBV. Until yesturday. I replaced it with one I had laying around. Ive always made 4 psi of boost. Now I make around 10. When I get towards 8 and 9 psi it starts stuttering and almost died once. Is my AFR off? Im not sure. I need to get the o2 bung welded in. Any ideas?