2, 3, 5, 6 misfire occasionally when idling. 3 and 5 more frequent.

[ChrsLytn]

208k mi. New plugs, wires, cap and button. Haven't seen any misfires show up while driving, only when it's idling. Probably need distributor, gear worn out? Whose to get and whose not to get? All of the 02 sensor readings are good. Thanks