A plug going bad can have the same symptoms as a coil going bad.
Along with being a regular part of your 997.2 maintenance you should inspect them whenever you get a misfire, a coil code or are replacing coils. The plugs are easy to change once you get access to them, but there are several components that need to be removed first.
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Project Time: 3hr
Tab: $7-1$20
Tools: E12 Torx, 13mm ,16mm thin-walled spark plug socket, extension and ratchet
Parts Required: Spark Plugs
Performance Gain: Better mileage
Complementary Modification: New Engine Air Filters