the nice weather made me want to take my yz250f out for a ride and it has been sitting in the cold in my shed since the end of the nice weather last year. when i put the bike away for the winter it ran great but now when i start it, it stalls unless im giving it throttle. i adjusted the idle and when it idles right and you give it gas it stays at high rpm for a long time before going back down to idle. it also doesn't ride well at low rpm's. it runs like a completely different bike and i dont like it i have no idea whats wrong got any suggestions?