I will try to make this as short as possible. Took the ski out, ran perfect all day. All of the sudden, at the end of the day it would die if we let it idle. While on the trailer, hooked up water of course, got it started, gave the idle screw a small turn, idled and ran perfect. Next day out to the lake. Got it on the water, it would only idle. Give gas, it would die. Back on trailer, would not start at all. pulled plugs, have spark, put plugs back in. Then, as turning it over, it would make a loud clanking noise and lock up. Got it loose with a pipe wrench, would turn a few times then lock up again. If i pull the wires off the plugs, it will turn over all day long with no problems. As soon as i add fire to them, It will turn a few times then stop not always locking up but wont start even with adding gas to plug holes. Help!