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LJM
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I don't really have an answer except to say that the problem went away when I drove the car more. I typically drive it about 1000 mi/yr. but there are long periods when it just sits. I also have an '06 but with a manual. Contrary to your experience, my problems showed up when I was driving the car gently. I should add that changing gas stations may have helped. I typically fill up at a 7-11 because it is close to my home but when the problem arose I switched to Sunoco. Did that solve it? Maybe. Did driving it more help? I don't know. I did nothing else and the problem did go away. I have a Durametric and was able to check the output from the gas pedal when the car was not running. It was linear without any interruptions. That's all I have. Good luck!
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I have exactly the same problem. Car is also a 2006 Boxster S, about 44,000 miles, and it is driven sparingly. Only about 800 miles this past year. The only fault code was a cylinder 5 misfire. Plugs are fairly new but the coils are original so I plan on replacing them shortly. I don't think a misfire in one cylinder would lead to the major (but brief) loss of power I experience. It feels electrical rather than fuel related (unless the fuel is shutting off completely) and my Durametric shows the output from the gas pedal to be smooth and reliable. I have not done anything with the throttle body. Was this issue ever resolved? Thanks in advance for any help.