Hmmm... 2 and 3 aren't on the same coil, so, hmmm.... The firing pairs are:
1 and 6
5 and 2
3 and 4
When my original coil rail went bad, my misfires were 1 and 6. I did a crude but effective test on the rail by putting together six grounds on clips and having one of my kids crank while I watched the spark plugs. Which verified 1 and 6 weren't firing. So, I was sure the coil rail was my problem.
Was strapped for cash and went chicom cheap on the replacement and it fixed it. For awhile
. Second time around I ponied up for the factory part and no issues since.
But, anyway, 2 and 3, I'm leaning towards NOT the rail? But you could test it easy enough like I did mine and find out for sure.
Might be a longshot, but I have actually experienced this, so worth mentioning. A big hit COULD have jarred loose some fractured material in the precat on that bank? Plugged up one of my precats and gave me the same symptoms you are having. Seems like you have already replaced yours though? Like I said, a longshot...
I'd test that rail. And if that isn't it and if your precats are original, I'd put a scanner on it and see what the o2 sensors are saying. If that's not it, I'd do compression and leak down tests. Then spray the injectors onto a piece of cardboard or something. And if you still haven't nailed it down it's an electrical problem