Distributor cap
I had mine start running like crap out of the blue. Got a new Delco cap that was even worse. Went to a third cap and all has been fine ever since.
Don't assume these crap caps are good just because the contacts look good. If you notice inside the plastic, there are runs or traces where they have to put the contacts on the sides. Internally there can be not exactly shorts but it can fire between those traces.
I have one I can send you if you don't believe it. So you should replace the cap.
One other thing you should replace but I don't think it is the cause of your #5 misfire. That is the coil. They are considered a tune up item.
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