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It is probably bad gas. I had the same problem about 2 months ago.
Car has been running fine. On the way to work I stopped at the gas station (Shell - always go there) and filled it up with premium. Aproximately 2 miles down the road my car started backfiring, shaking, and wanted to quit running. Made it to my dealership where they put it on their tester. All cylinders were misfiring and errors all over the place. They kept the car for several days and compared with readings of another Boxster. Finally put in a can of Octane Booster and observed it for awhile longer.
Bottom line - bad gas. Cost me $400.
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