Hi guys, I read quite a few posts and cant gwt to a conclusion that seems right. For a copuple months i've felt like my boost hasn't been up to par. I dont know how to check my boost pressure being there is no stock guage and my diognostic computer doesn't show a boost pressure either. Just last night i took off with the throttle wide open and really wasnt feeling the kick at 3500 rpm and my light came on. PO171 System too lean (Bank 1). I am pretty sure I can hear the turbo spooling up. Is it likely the i have a stuck bleed of valve or something? Please help.