I have a 2012 mercury 90 hp efi outboard that had a spongey looking air filter on it... I noticed the air filter was missing a big chunk of it and some of it had to have been sucked into the engine. I replaced it with mercurys new version air filter..the engine starts fine and runs good at normal speeds.. the only issue is when I troll with it at low speeds it runs rough and eventually stalls. Did the air filter being sucked in be the route of this problem?
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