Here's the deal, I have a stock blow off valve with a check valve that is vented to open air. The BOV is leaking when I'm on boost, not when I'm in vacuum. GOT ANY SOLUTIONS???

 

Depends on how much boost you're running. I'm not sure exactly how much boost the factory BOV can hold without leaking, but it's probably at least 10-15psi. If you running less than that and it's leaking, it's busted and could just be replaced with a new or second-hand stock one. If you're running quite high boost it may simply be time for an upgrade.