I just purchased a 2009 yz450f. While riding home I ran out of gas and a friend gave me some gas to make it home. Now the bike doesn't wanna idle and has a miss while riding. I love the power of my bike but am stumped to why it will not idle and run without a small miss. I did notice that the rubber boot from cylinder to carb looks like it has a couple cracks. Can you guys tell me what all could cause this so I can start trouble shooting one thing at a time. I love this bike and the power but I've not owned one since I was 13 and I'm 40 now.