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PO507 is a high idle. Could be a sticking throttle body or intake air leak. Look for loose or torn vacuum lines, loose or torn intake tubing or clamps, torn AOS bellows, bad gas cap, bad oil filler cap or tubing.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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