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That sounds pretty nasty... The secondary air system sounds pretty plugged up.

I've assembled a number of related questions that could be related to this symptom.

Check out the about a rough idle / codes 171 & 174 on a Windstar. This is about a TSB isssued by Ford and the Windstar Intake manifold "isolator bolts", AND a change in the valve cover design that causes lots of oil in the wrong places. Strikes me as something to be seriously looked into for your vehicle.

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Q: Why is your PCV valve hose leaking oil at the pcv side and the mass air flow side on a 2000 ford windstar?
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