You can prove its a sticking PCSV by removing it and apply vacuum to the intake side of the valve. It shouldn't leak any vacuum. If it does, replace it. It if doesn't, I would apply 12 volts to the PCSV, and then test it again. Basically to see if it sticks.
As far as removal/replacement goes, it depends which engine you have.
2.7 DOHC V6 - Can be a bit of a pain. It's located just to the left (if facing from the FRONT of the vehicle) of the throttle plate, attached via a rubber hose to the intake manifold. Plan on replacing that hose if you remove it.
3.3 DOHC V6 - See, you can have your cake and eat it too! It's mounted on top of the intake manifold, slightly to the right (again, facing the FRONT on the vehicle) side of the engine. Should be as simple as take the engine cover off, and remove the valve (2 hose clamps, maybe the bracket bolt). Hoses usually stay in one piece, but if you feel you've damaged them, don't hesitate to replace.
If someone can post pics, you'll see how relatively easy the 3.3 valve is. REGARDLESS of engine, the valve is designed to flow one direction. Pay special attention to how it is installed prior to removal!