Very old gas, 5 yrs, however engine starts and runs above 1200 or so rpm's very nicely, hoever trying to bring it back down to 800 for idle speed, it dies right away. I cant seem to adjust the mixture to solve this with the idle mixture screwes. Choke is wide open and when I actually close it partway when boat is idling at 1200 rpm, it will rev up another 300 or so rpm, indicating to me the mixture is to lean, possibly not enough octane in the gas?
