Even though it shuts off abruptly, I would check the fuel pump pressure. It sounds like it can't keep up and runs the float bowl dry. Then refills it when you try to start.
I've seen this happen with the Facet electric pumps when they have the "stuck ball" problem.
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@(^.^)@ Ed
1977 Pearson P-323 "Dolce Vita"
with rebuilt Atomic-4
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