If it is rust formation due to water intrusion from the tops of the coil packs.
That is a pretty easy fix.
After cleaning out all the rust from the spark plug wells and coil packs.
Coat the sealing ring of each coil pack with some silicone grease to create a water resistant seal.
Might also try coating the coil extension tube and a bit inside were it makes contact to the spark plug.
See if that solves the issue.
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- Reply To: Misfire cylinder 1 and 2 after rain. Replaced spark plugs and ignition coils.