My 06 6L just dies without warning, first time was siting running and died, all lights still on, tried to start but just kept turning over, next day Started for tow driver. I drove truck half hour and died and just keep turning over next day no start checked fuel pressure and was good when turning over so quickly turned on and off 6-8 times and then it started right away. Have left sit running for hours and no problem. I am afraid to drive but really need truck for work, Please Help