The instant restart points me away from a fuel problem. I would perform an ignition hot wire test (alligator clip jumper wire between the small coil + post and battery +) to determine an intermittent (loose) connection in the ignition circuit. Treat the jumper like an ignition switch, do not leave it connected without the engine running or else you risk permanent coil damage.
Catalina's trailer plugs in the engine harness are a known problem.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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