hey i have a 15ft 66 chris craft with a 75hp chrysler 3 cylinder. after a lot fo work i just got it on the water this weekend. it always ran good outa the water and it ran good for a little while on the water. then i start cruisin almost full throttle and it was just die like it was losing fuel. i wait a few min and it started back up but ran rough. start crusing again and it would die again. after i got it back home i ran it on the muffs and it felt like it was missing so i pulled hte ignition wir off each cylinder and top and bottom stalled it out and middle did nothing. checked and had spark there though. next i went to each cylinder and turn the air/fuel mix screw in all the way and top and bottom cyl's stalled the motor and middle did nothing so i conclued theres a problem with the air/fuel mix on the middle cylinder. can some one help me with the carb dont no much about it or what can be wrong. thanks a lot guys really apreciate it.