Did Autozone identify which cylinder was involved? The common misfire codes (P0301-4) are each tied to a specific cylinder, and when coupled with the wet weather problem you've reported would tend to suggest a leaky plug wire or leakage where that wire plugs into the coil pack.
Time to get down to 1000 RPM? Nearly instantaneous on my Forester.
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2003 XS Premium MT - 2005 Impreza 2.5 RS MT
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