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The car is running lean so it is either an intake vacuum leak or failed MAF sensor. You can rent a smoke tester at many auto parts stores and they work better than other shade tree methods.
If the MAF sensor is more than 5 yrs old I would change it.
Use an OEM fuel cap as many aftermarket caps do not seal completely.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 09-20-2018 at 08:38 AM.
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