It is perfectly normal for it to suck in air at idle. The BOV is before your MAF right?
I know this seems obvious, but did you hook up the vacuum line? The stock bov flutters sometimes, but it's not very common. Usually that flutter is asociated with BOV-less turbo cars.
Mike at QPR has a device that he can hook up to the vacuum fitting on your BOV to test it and see if it will open. That would be another good thing to try.
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