ill tell ya right now what it is, its the plug that comes from your key switch that goes to the main harness. mine was doing the same thing, take off the gas tank and locate the plug ill bet its got a loose wire in it. set the tank on sideways fire it up and pull on the wires going into the plug from the key switch, it will cut out figure what wire is loose and cut it and hardwire it to the coresponding wire it would connect to in the plug, or wliminate the whole plug and wire them all direct, i had this happen on a couple of my shees and everyone swore up and down it was the tors or the ebrake cable. let us know if this was the problem