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If you haven't yet replaced any of the coil packs, that's where I'd start. Given the age of your car, I'd just replace all of them, but if you want to start with just a few, replace the ones on whichever cylinders are giving you misfires.
You don't know if they ever got wet with oil (from leaking spark plug tubes) previously, or are just old and on their way out. If the insulator end of the coil pack gets even the slightest bit damaged, they will cause misfires.
Also, any moisture between the wiring harness weatherpack plugs and the coil pack can cause issues.
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Boxster S
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