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typically misfire under a load is ignition and based on what you found i would say that is probably it
now on my dx i had something similar. i have a 15 min drive to town from my house, I work in town also. if i drove my dx to work and back only i never had a problem, but if i went to the post office or something before work, or if i went into town for groceries or went to a friends house it would act up. If i drove the car and got it hot, then let it sit for a few mins to a few hours then started it back up, it would start fine, but when i went to take off it would miss. then once you got around 3500-4000 rpms if would clear up, you could floor it and it would pull fine until you got back down into lower rpms. It was a funny sounding miss too. Rapid sounding if that makes since. Anyways the only thing i could figure was when i would shut it off it wasn't getting as much air moving around under the hood so the dizzy would sit there and heat soak. Based on my experience of distributors in hondas i figured it was a good guess and just went ahead and ordered a use dizzy from ebay. And that turned out to be the problem.
But it was similar to what you describe, because sometimes if you gave it WOT it would quit missing even in lower rpms
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