my 2010 gas tractor recently started stalling out after it sits idling for at least 5 minutes. It will fire right back up, idle for 5 minutes then slowly stall out again. Hopefully this coming weekend I'll have time to dig into it a little bit. The carburator has supposedly been rebuilt a few years ago, along almost every electrical component on it since the previous owner hooked up the battery backwards and walked away only to find melted wires when he came back. The gasoline is fresh. I'm no tractor mechanic, so were would you guys start looking for problems...? thanks for the help in advance.