if it is a stock carb set up:
Look for the choke pull off on the passenger side of the intake manifold. It has a rod that goes to the choke. Remove this (2 bolts & the rod) and underneath there is usually a nut that you can use to set your choke leaner or richer depending on which way you turn it.
Then put the choke pull off back on and try it. Repeat as necessary until you get it to run better.