lol, the BOV wankers are getting more witty by the minute.
Maybe you should install a second one, it should make your BOV sound louder, and more women will get wet, and try and dive through the window.
Thanks for thread number 5,000,001 on "omg guys, my fully sick BOV that attracts women and police, is making my car stall. omg, why? I know absolutely nothing about how a vent to atmosphere introduced an air leak causing MAF equipped cars to stall, so I'll just post another thread on here and ask the question for the 5,000,000th time."
Long bullshit story short:
If you want your car to behave, put the stock BOV back on. There is a reason why it returns the air back into the turbo, not to atmosphere.
If you have a larger turbo, and need the extra volume "blown off", install a recirculation aftermarket BOV, not a duck whistle atmo one.
Second hand GTR ones are also good. You need to plumb them back too, of course.
There's your explaination. You're actually lucky you got one before your thread got locked.