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Misfiring occurs when the spark plug arcs and tries to ignite the compressed air/fuel mixture in each cylinder, but for some reason, can't. It could be due to oil fouling, insufficient air or fuel, spark plug erosion, etc.
My Boxster had been in the shop twice before I owned it because of similar misfire codes. Both times, they "smoke checked" the exhaust (to make sure it wasn't burning excessive oil) and then simply replaced the plugs. The problem cleared up, but about 6000 miles later it returned. Again, it went into the dealer and they simply replaced the plugs again. I've since gone nearly 15,000 miles without incident.
I suspect the previous owner didn't wring the engine out as much as I did.
You may have a failing air/oil seperator, which can dump excessive oil into the engine. Did you notice any smoke when it wouldn't accelerate?
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