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Dirty idle control valve - Why


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So I had some stumbling at idle a few months back and cleanded the IAC valve with great success and then the car ran like a champ BUT it is now getting bad again after 3 months. Why is this happening?

 

Is it blow by causing this? Car has 190K KMs on it and seems to run great still with lots of power.

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Erm, Josh...the Subaru PCV works "backwards" compared to most others. The PCV valve draws straight from the crankcase, pulling fresh clean air - ahhh! - through from the valve covers. My point: A catch-can/oil-separator would only be needed on the hose that connects up to the PCV valve.

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