recently purchased a pontoon boat with a 50 hp johnson j50tleod Have put it in water twice now and have a hard time keeping it running. Fires and starts I push switch in to choke and it stalls several times until I untie lines start it and get underway. After a few min running at 1500 to 2000 rpm it starts and idles fine. I cleaned both carbs what else do I need to look at. When it idles it is close to 1000 rpm.it also runs well at full throttle after it warms up
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