I need some help fixing my Jato. When I first fire it up, it will run fine, but once I make a couple of high speed runs after its warm and bring it in it will just shut off. When I let off of the gas it will shut off within seconds. Then I can't seem to start it until its cool or something. I've done everything the book says to do, and now im back at the factory settings, and still it seems to do the same. Can anyone give me some advise?