If the vacune line you speak of runs to a valve on the right side of the carb(passenger side) that is normal to be small. That is the air bleed which purpose is to stabilize the air/fuel mixture when going from wide open throttle to idle. It keeps the engine from dieing out. You said that the plug is chalkey. Is it black in color? If so you are not running lean, but on the rich side. Now as stated in previous post, it could be the cdi or coil breaking down. Also make sure that the 2 wires that plug into the back of the coil are a snug fit. I have experianced problems such as yours if they are too loose and not making good contact. I have also had some that were just barely connected. Also what is your location?
Tom
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