'64 Ford 2000 4 cylinder gas engine starts easily and runs for about 10-20 seconds then stops. It will start right up again and run for about 10-20 seconds and stop again. It will do that over and over again. It also stalls easily when the throttle is increased. It sounds like a fuel supply problem, maybe the carb. Is there a procedure for cleaning or rebuilding the carb or do you think its something else?