I just recently got my stique up and running and well it runs find other then the added knock from what i have no idea. But it keeps dying on me every time i get off the highway at an exit. It does just fine though town. But it dies when i get off the highway before i even coem to a stop. it does this no matter if i put it in neutral and brak to a stop or leave it in gear! What could be cuasing this?