I got a little deep on my foreman 500 just before snorkel was gonna go under I shut the bike off. The snorkel dipped under for a second and I got it back up. I winched out of the hole. Pulled drain plug on air box (1cup of water or so not full) I then checked oil and it was clean I fired bike up and it took about 10-15 seconds to fire up ( normally starts right away) I then started riding it everything was fine after about 5 min it act sluggish like dieing down for a split second then had full power. I stopped checked the obvious again and was all clear fired right up like normal and started riding back to the house every few min it would be sluggish again and then normal! Any suggestions on what it may be? Water in fuel?