I have a 97 Suzuki 800 Intruder in which I bought gas then my bike started backfiring sputtering and shut off I waited a few minutes it started back up and it did it again and then it wouldn't start i trailered it home thinking maybe I bought bad gas but I emptied the tank and it wasn't the gas I checked the voltage it's getting fire the fuel lines are fine i crank It Up the next day rode it around for about 10 minutes ran fine did the same thing and wouldn't start back up it keeps doing this what could it be?