I have a push mower with a horizontal engine (I guess most are), piston pumping front-to-back. Any time I run it into an obstacle, it misses a beat, just from the inertial shock out of time with the piston travel.
My interepretation of the original post is that it misses just one or two strokes on impact with a large bump in the terrain. I suspect in this case that it is not fuel related, as there are not many fuel supply problems I can imagine that will cause an engine to miss a quick stroke or two and recover. It's more likely a mechanical problem (governer bouncing, etc.) or electrical.
Is your ignition coil oil filled or potted? Oil filled ignition coils are KNOWN to display this behavior, as the coils bounce around unconstrained inside, and often break in intermittent fashion. I have been thru that exercise twice before.
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