it could be sniffing it’ own fumes from a bad lower rubber skirt in the lower hexaust housing.. does it idle better with the cowl off ??
could be dirty carb ignition issue link & synck played with the idle mixture needle etc…
have your upped the idle a bit with the side knob
Johnson (leeroysramblings.com)
check utubes parts 1 and 2 on full carb cleaning
(1542) 9.5 Hp Johnson Evinrude Outboard Carburetor Rebuild – 1of2 – YouTube
(1542) 9.5 Hp Johnson Evinrude Outboard Carburetor Rebuild – 2of2 – YouTube
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