Help! I just purchased a used boat with a 9.9 2005 2 stroke,I have to mix oil with gas in a permanent tank. When I try to start it it will start for a moment then stall, it smokes a lot, I have cleaned the carburator, changed the plugs, and check for spark and fuel. When I get it to idle for a minute and then give it throttle it stalls, when I give it throttle and then start it it will run for a minute and smoke up the yard and stall. Could my gas mix be to rich in oil? It act flooded but tries to run with the choke out. any advise for a newby?