this is a dumb question but has your dealer plugged into the sled to read all stored codes? also i remember reading about someone having a broken wire to the fuel pump i believe it was under the seat near the pump. Also there is known wire rub low on the front of the engine on clutch side on a casting nub near bottom of engine my wire harness was starting to rub on there when i looked. Sorry i am not more help. mine wouldn't start once either at 20 below, code 43 also. left it over night and it started up the next day, never did it since.