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Losing power / rain / gas gauge malfunction

2000 Chevy Astro. After driving my van through a heavy rain storm, I started to lose power. I parked and turned the engine off. When I started the engine again, my gas gauge jumped quickly all the way to full then settled to half-full, the correct reading.

When was the last time you changed the plugs, plug wires and fuel filter?

Plugs and wires - a couple years ago. Fuel filter - never. Could the filter affect the gauge?