3.0 sport

Hi All! First time posting. Have a problem when idling - needle will range from 1,000 down to 300-400 back and forth. Runs fine when throttling 5-30Mph etc. Only when idling does it stall and sound rough. Wondering if anyone has an idea what the problem could be. Another thing to note is that...

Ive been combing the forums the past couple weeks & decided to make a account. Owned a 1998 Chaparral with a SS19p prop 13yrs that planed out quick but wouldn't stay on plane at lower speeds. Best mph was about 55 per the gauge on calm water. Sold the Chaparral & bought the SeaRay as I liked...