It would, but I would consider other things first. Your PCV valve is located behind the throttle body, with a hose connected to it. It makes a 90 degree bend with a plastic elbow after the hose, into the valve itself. Take it out and shake it, if it does not click or if it is covered in oil, replace it with a new Motorcraft unit. Some aftermarket units will not seal the boost like the stock unit will, and thus oil will leak into the system even with a new unit.
How dirty was the oil you took out? Does it run well w/ full power?