They could very well have gone bad from the water. If I were you I would take them all out, remover the boots and check for any water. Spray them all down with canned air if there is any wetness. Check the wells to make sure they're dry, if not dry them out and with a small rolled up paper towel and the canned air. Put them back in and if you still have the misfires, find out which code it's putting out and change out the coil from that cylinder. If it continues, replace all of them.