Help, I need a list of what to check for the following problem. I have a Craftsman LT 1000 with a 17 horse Briggs and Stratton Engine and Auto trans. I have encountered the following problem the last two times I mowed. After mowing about 1 hour, the engine starts sputtering and then dies. I know the mower has been neglected this year. After sitting for about 30 minutes, the mower will restart and run another hour before the same symptoms return. I plan on replacing the plug, air filter and fuel filter as a start. But could the problem, as it starts and runs fine for a while, be more serious? The mower is about 5 or more years old. Any assistance would be greatly appreciated.