It sounds like you've got a little condensation in the gasoline. A couple of bottles of Dri-gas or just a quart of Methanol from any home improvement store in the gas tank will absorb the water and probably make it run a little better. If that doesn't help, do the routine tuneup stuff- - - -check the condition of the points, plugs, timing, etc.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!