After replacing my vacuum hoses, I was able to reduce my idle some. I ignored my vacuum elbows because I thought they looked good. I pulled one and there was a very small crack that was not noticeable until you removed it and squeezed it. Replaced it and my idle issue has been solved. Don't ignore those elbows!
http://www.autoatlanta.com/Porsche-Standard-Vacuum-Elbow-Parts-PN-R022129637.html
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Yep,I change mine every spring......
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