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From the codes you might have a couple of ignition coils failing. You could try swapping the coils on cylinders 2, 6 and 7 with other cylinders to see if the misfire codes move around. Do you have a scan tool capable of monitoring fuel trims?
I would probably try a compression test and see if any of the cylinders are lower than others.
Also, what brand of plugs were used when you swapped them out?