I have been fighting my 706 263 gas for a few days now. It will stay running just putting around the barn lot and down the road but when I take it to the field and put a real load to it it runs great for a couple of rounds then coughs a couple of times and dies, some times I can clutch it and fiddle with the choke and keep it running. It seems to heat up 10 to 15 deg right before it dies. When it dies it will fire right up. I have put a new coil on it and rebuilt the carb it seems to have good gas flow to the carb and the fuel bowl is clean i looked in the tank and it looks good and clean. Any ideas on what might be the problem would be greatly appricated.