I have seen this answer already bouncing around on the internet and in my case is not entirely correct.
I reliably replaced three of the coils over the years because the OCM gave me specific cylinder misfire information.
Also, how do I know if I am getting a good coil from the parts store? The bad coils don't really test as bad with an ohm meter? I have the three that I know are bad and they test out the same as the good ones.
Kind of an expensive experiment at $80x6 if it turns out not to be the problem.
My next intended step for tomorrow was to purchase one front (246) and one back (135) coil and systematically replace each exiting coil and test drive. The only flaw here is if I have more than one bad coil going at a time - or I get lucky?
You were correct, I had three remaining original coils. I replaced them and all has gone back to normal no codes.