It stalls if I let go the the throttle in the water. I have to keep feathering it to keep it running. It runs fine until idle while in water then stalls. I figured it needed an idle adjustment but since its running around 27-2800 rpm out of water, i decided against it. Any other adjustments needed for this problem? Maybe high or low screw on carb? It's a dual carb on a 92 xp. thanks