My 2012 R20 has the PCM 303HP engine with only 56 well maintained hours on it. Boat has run with no issues and today after running for about 20 minutes shutdown unexpectedly. The problem doesn't seem to be electrical as the batteries are healthy and the boat easily cranked over after the shutdown. The engine turned over and didn't fire right away. I let the engine rest about 5 minutes and it fired up to a normal idle. Applying throttle slowly the engine will engage and thrust and as long as I maintain lower RPM's runs smooth and fine. Applying heavy throttle the boat engages and then shuts down again afterwhich another rest period is needed for the engine to fire (otherwise just cranks over). When the engine caught, the exhaust smells a little rich for a short period. The fuel in the boat is fresh. Any suggestions on trouble shooting this are very appreciated. Cheers.....