Had a coil go with similar symptoms not long ago... usually they either go bad quickly but I've seen a few go intermittent like that... were you driving in rain by any chance? Should spit a code P0300-P0305 if its a misfire caused by a coil.
H
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Previously owned:
2000 Boxster S 3.2 Ocean Blue / 1974 911 Targa Silver
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