Hi,
On my 07 Cayman S I had a very rough idle and misfires my issue turned out to the be AOS.
This is a link to my post about it, hope the info is helpful in identifying the cause.
http://forums.pelicanparts.com/boxster-cayman-forum/999842-my-aos-failure-symptoms.html
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68 912
73, 74 (2), 76 914
80 911sc Targa, 81 911sc Coupe
81 928 Euro, 86 944 NA (sold)
07 Cayman S
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