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15 horse Evenrude running ruff kills when you slow down, popping and sputtering now, ran great first time out no sputtering but did kill when slowing down each time. Used motor 1978 or so, no model number tag or anything on it to identify it's model or year. Old gas, stored for 3-5 years, got new gas ran it for 15 minutes still kills when you slow down. Running seafoam in it did put some in the carb several times still getting same result. I will try new plugs tomorrow. Any help would be great.
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Did you pull the carb and clean it? It sounds like you have crud in the low speed side of it. In the throat right at the baffle/flap there are very small holes that allow the slow speed fuel or idle fuel into the carb. They are really hard to see and care must be taken when you clean them, I use torch tip cleaners because you can bend them to reach in at an angle, use the right size and don't make the hole any bigger or you will have new problems.
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