the motor idles fine but will not get up and go. ran fine last year when i put it up. getting spark to all 3 cylinders.fuel pump looks fine when i took it apart. tried squeezing bulb when throttle all the way open and no change. cleaned all 3 carburetors still same problem. the other night only used half throttle it would sputter and try to run. but when i give it full throttle it would just stay the same like not enough power. any clues Thanks