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Hi Dale,
I am not a mechanic but clearly your cylinder is not firing. I am curious why you suspect a "sticky" valve? It could be that but it could also be something else. Make sure to check ignition leads, maybe swap a fuel injector and see if problem remains unchanged or follows the injector nozzle. Replacing plugs eliminated a bad plug theory but I would make sure to exhaust all other possibilities before pulling the jug. There is probably other trouble shooting items to check, maybe the flow divider. I don't know if it can fail in that manner but I do know you need fuel, air (compression), and spark to have combustion so check anything that has anything to do with any of these.
Good luck,
Ed
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