Did you ever manage to figure this out?
Mine has just developed a misfire on cylinder 6 as well. Haven't had a chance to dig into it properly or plug the laptop in to see what's going on, but in my case I know it's not injector-related as I have the same misfire on petrol or LPG. I've swapped coils/plugs quickly and didn't make any difference. Hoping and praying it's just something simple like damaged wiring and not a dead cylinder with low/no compression. I'm on 260k miles, so anything is possible.
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