My 1996 ZRT that I used to have did that sometimes. It usually happened when I was asphalt racing it and water would get down into the wiring connectors right above the recoil and short them out I guess. You probably got some water or antifreeze down into the connectors. Just disconnect the wires and clean and dry them out and you should be good to go. Gets to be a bummer using the choke to shut off the sled doesn't it? Later.