Abstract: A control method for coupling a first engine to a second engine in a vehicle includes determining a current position of a throttle body that regulates power output from the first and second engines. Determining a set speed for the first and second engines that corresponds to a desired power output from the first and second engines. Determining a compensation position for the throttle body and moving the throttle body to the compensation position. Actuating a clutch to a closed position such that the first engine is coupled to the second engine. Determining whether the first engine and the second engine are in phase. Actuating the clutch to slip if the first engine is not in phase with the second engine and actuating the clutch to the closed position when the first engine and the second engine are in phase.