My Sandancer 270 1994 (powered by Mercruiser 7.4 liter 330 HP V-8 engine which is attached to a Bravo II duo-prop outdrive) suddenly lost RPM around 3,000, sounds "chocked" (continue to work in low RPM) and after a minute is back to "life" but it happened 3-4 times within 1 hour while cruising and increasing RPM to 3000. in low RPM didn't experience it.
Any advice will be highly appreciated.
