Hello 1972 Fiberform 165 hp 6cyl inline GM This thing starts so good, idles so good runs under low / medium/ high power setings so good. Butttttttttt when you go from idle to gently engaging forward or reverse it will backfire thru the carb. Maybe once or rapid 3/4 times then stall or transition into your desired settings. I,m no boat person just a helicopter wrench. This thing does so much right I just don,t know where to look. It set for 4 years, but once again it started right up. I,ve run at least 20 gallons of fuel thru it . Ran a can of Gumout thru it and a can of Heet also . Help a poor guy out. Thanks Jim Athol Idaho. (EDIT) THANKS
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