I have a 89 150hp force when i first start the engine prime the bulb the press the ignition to prime fuel into to carb as i'm pressing the switch i turn the switch to start the engine. it runs, i let it idle for 5 sec then release the switch to let it idle on its own it dies after 5 secs. i do it about three times tell it finally idles on its own, after that it fires up beautifully my question is it suppose to do that being carb. or is there a problem