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Good morning I have a rough idle on my 2004 Passat 1.8t after a inspection of the vacuum lines I found this part thats on the back side of the airbox where the air clearner is on the passenger side I disconnected the one hose for the picture the question I have is what is it would it affect the idle and where can I get a new one. thanks
 

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one way check valve. 058 905 291 is the part number. buy from wherever. Amazon probably the quickest. If you have a few parts to buy, FCPEuro.com.

Yes, it can affect the idle. It is a vacuum leak. For now, seal it up carefully with a little epoxy. Let it thicken a little before applying so it doesn't seep into it and harden on the internal valve itself.
 
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