I'm with PK, first thing I thought when I read this was fuel starvation. I'd check pressure and supply, fuel filter, fuel pump, fuel pump control, and if the Boxster has one, the tank sock (mesh filter in the bottom of the tank).
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Paul B. Anders / Phoenix, AZ
1970 Porsche 914 / 2003 Porsche Boxster / 2009 Honda Fit Sport Auto
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