Hi all! I'm new here. I took my 2014 Stingray out Mercruiser 5.0 mpi. Boat ran fine however after sitting out on the lake for an hr listening to the radio the engine restarted ran really rough for a minute and died. I was able to restart...again it ran rough and died. After a few more tries it eventually would not restart. Changed both batteries, spark plugs and IOC and still getting the same results. At my wits end here! Any suggestions would be appreciated