This is what I have checked, vacuum advance is good, removed vacuum line at carb and used my vacuum pump. cap and rotor have no cracks flash points, pulled the plugs, all are of good color and uniformly. I did pull the valve cover and no problems with valve lash. I rattled the PCV valve to make sure it's free.Unless somebody has any other ideas, it's back to the carb. my thoughts are if the only times it doesn't misfire is at idle and hard acceleration, then it points to the primary (low speed) circuit in the carb. I have to finish a small project and then I will work on carb and let you know if the problem is solved...Thanks for all the help
