I took my boat out on the lake. It fired right up but when it put the start lever down and turn the choke off the motor dies. if i leave the warm up lever up it stays running for about 1 to 2 mins then dies. its always hard to get it to fire back up after it dies. but the fuel line has got pressure. and its got good spark to all banks.any ideas im a lil lost was thinking maybe the carbs need re built. but im not real sure. Any ideas are apperciated. thanks