My Indmar Assualt 325...2005 has been running great, but last night when I got the boat out in an emergency I ran the boat without properly warming the engine a short time at over 3000 rpm a mile or so to help a friend. On my return the boat began bogging down and then overheated. I shut the engine down and it was belching from the exhaust due to the heat, after it cooled...it did restart and sounded fine, but again began over heating. Any thoughts?