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I personally never use 5th at under, say 55mph. I find that even routinely driving in a spirited manner, quite a bit of city driving (in my car at least) creates a situation where the car has difficulty in idling when cold, and it develops a mid RPM miss. At that point I usually add some Techron to the fuel and take her for an "Italian tune up"....this invariably solves the issues. My car at least, doesn't seem to thrive when driven at low RPM. I usually use 94 Chevron (available here) which contains no ethanol. From your description I wouldn't be concerned with the clutch or tranny, either the fuel or the spark were temporarily "acting up"...and was said before, probably a little water inside the cap.
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