From what I can find out about it, it's a 1985 model. Can you post a pic of it ??
Ok, so I had a mobile mechanic give me a hand, turns out I had some pretty dirty injectors. He got them all cleaned up and she purrs like a kitten.
Ben, please take a few minutes and read this write-up.
Thanks for the info Ricardo, we typical would flush the engine cooling system and fill it with fresh anti-freeze each fall when we pull the boat. than