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I can't help with the valve question, but on the miss I would suspect the ignition coil in the distributor. Because you say it only happens when the car is warmed-up. That suggests expansion of the coil expanding to a problem point under the heat. Could also be the ignition control unit in the distributor. I replaced my distributor with an Autozone unit and got a warranty and solved a similar problem. Hope that helps.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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