I HAVE A KUBOTA ENGINE/ ELECTRICAL GENERATOR THAT HAS DEVELOPED A ISSUE OF NOT HOLDING A LOAD WITH THE VOLTAGE AND RPM SAGING I REPLACED THE ELECTRICAL END. AND RAN IT FOR 3 HOURS IT SEEM TO WORK OK. THEN STATED SAGING AGAIN. 1) I HAVE REPLACED THE FUEL FILTERS AND PUMP. 2) REMOVED THE...