I have a Farmall A that I took to a parade last Saturday. parade was about 3 miles long and the tractor run great until the end and then it started acting like it wasn't getting enough gas, not like it wanted to quit just hesitating as we drove back to the trailer. I took the carb off and soaked it, put a new NAPA kit in it and it runs fine but I can't hear any differential when I turn the mixture screw in or out. I really haven't gotten it as hot as the day of the parade. A friend says it might be the coil breaking down when it get hot. Right now I'm at a loss as to what might be wrong. Any suggestions will be greatly appreciated. Thanks