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Went out fishing this weekend. Everything was great on the way out and then after our 1st stop the problems started. I have twin 2004 HPDI's on the boat. When we decided to move to a second spot one of them started running funny. It starts and idles fines. Also if you give it gas in neutral the RPM' seem to go up without any issue. As soon as you put it in gear the RPMs drop from 600 to about 400-500. When you give it gas it only gets up to 1000 RPM with the control all the way down. Prop spins easy by hand. Appreciate any guidance you guys may have. Boat is located in the Westerly, RI area.