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GMC Sierra 2500HD is having problems starting up after running and stopping and starting a few mintues later. Today while parked with motor and A/C on it died twice. Took a couple of tries each time to start up. Battery is charge at 12.73. Belts seem to be tight as normal. Fuel pump does its thing when I turn it to start and then turn full way and just cranks. Generally its a warm day or truck is driven 10 miles or so and then it starts. Any ideas or things to try? Thanks for any help. I know that a few others have had problems with 8.1 but no answers for this.