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My pontoon has a 2000 40hp 4 stroke on it. When I launched it it was ideling fine and got up to 1/2 throttle and it started missing out then died. When I try to start it now it will start and run for a second or 2 and then die. I completely replaced the entire fuel line with no changes. Out of about 20 attempts I can get it to run for about 4 seconds and then it dies. Any help would be greatly appreciated. Thanks in advance!