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I had a similar problem once with a 6cyl mustang. What had happened was the water had gotten into the distributor cap and messed with one of the cylinder's current causing it to miss-fire only under heavy acceleration. It just seemed to be down on power, when in fact it was having no or little ignition.
Now, it could be possible that since we have coilpacks on the boxster that one was fouled by the water or somehow water broke the seal is is messing with a single plug. If it is having a hard time getting a good spark it could miss fire or have a poor ignition.
just my thoughts.
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