1990 Carver 2357 Montego
Volvo Penta AQ271C 5.7 V8
Duo Prop
Engine back fires at 2800 to 3000 rpm's. Boat will not climb above 3000 rpm. Just pops and fouls a plug or two each time. But then will idle perfectly at 650 to 700 rpms New wires, plugs, distributor cap & rotor, holly carb equipt...