we have a 2004 700sportsman and everytime we go riding, the bike fouls the plug and runs like crap. We brought it to a polaris dealer to get fixed but everytime they said there was nothing wrong with the bike. After we let the bike sit for a couple days,  it runs perfect. We took it apart on the weekend and noticed there is like droplets of water in our air box. Can anyone tell me why there is water and why the plug keeps fouling?