I have a 1998 Vulcan 1500 that's been sitting for two years. Wouldn't start at first but after draining tank, draining carbs and filling with pure seafoam for several days it will start with full choke only but dies right away. it will stay running with starter fluid but I did notice something strange, that air was blowing out of the air intake instead of sucking in. I'm hoping it's a vacuum issue or air is being sucked in from elsewhere aka air leak. when it does start and I keep it running with starter fluid, giving it any type of throttle causes it to die. Any thoughts on how to troubleshoot what the specific problem is?