I just bought a new boat and and have not yet put it in the water while working on various items. The 1999 150 Johnson (Carborated) starts easily but idles at 1300 RPM with the flushing muffs on. I know that the Quickstart system is supposed to keep the idle high until it warms up. I've run it for 15 minutes or so and the speed still has not dropped down. I also know that Idle speed is supposed to be checked in the water in gear but 1300 seems a little bit high even for running in the driveway. Any comments/advice?