My cruiser has 200 hours on the Mercruiser 5.7L Mpi motor
. One day she was running quietly and the next time I took her out, I noticed a grinding noise
that seemed to come from the air intake. The more throttle the more the gringing noise
even though she runs well.. When in idle, she runs quietly. When cold, she stalls a couple of times but starts right up again. Dont know if the issues are related.