I was mowing w/ my D100, about half way complete on one acre, and it started sputtering and eventually quit. I made sure it was full of fresh gas but it would not start back up. It is only two years old but I replaced the Fuel Pump, Fuel Filter, spark plug and battery all of which were from the JD Dealer. Even when spraying w/ starting fluid, it still will not start. I will fire and run for a few seconds but still not right. Could it be the carb?