I'm with Joe, check the valve lash. The manual says no tune up is complete without checking/adjusting the lash. If that doesn't smooth her up check the usual suspects, the carb, ignition components, distributor shaft wear, etc..
Save a life, adopt a senior shelter pet. The three main causes of blindness: Cataracts, Politics, Religion. Name your dog Naked so you can walk Naked in the park.
