gm 305

ok i have been messing with this motor for a while now. It seems to no power when i give it full throttle. it will start backfiring when i use the trim controls or the tilt. its a 21' searay cuddy walkaround with a 305 gm motor. i just had the carburator rebuilt which cost alot. its a edelbrock...

i am so frustrated! i have a 83 21' searay with a mercruiser 305 with a 4 barrel edelbrock 1409 carb. i rebuilt the carb and that seems to run fine when i am out of the water. the motor sounds and runs perfect out of the water. When in water, i have no power. the engine is at about 3500 rpms am...