Classic AOS symptoms. As Rex says, you don't want to drive your Box if it has a bad AOS. Worst case is you can hydro lock your engine which results in a bent or broken rod.
Have you checked your oil level? A bad AOS lets oil into the combustion chambers, causing all your symptoms. Remember to check it after replacing the AOS, as it will probably be low.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
1987 928 S4 - Granite Green Metallic (Felsengrun)
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