i have a johnson 9.5 1972 outboard in excellent cond.like new.it has been setting up for 20 years.when i first ran it on my boat it ran good,but latter on it started to run rough.when i cracked the throtle it would almost die and have no power.when i pulled the choke out a little i would smooth out and run pretty good.does anyone know what could be causing this problem..thanks robert
