It is possible to have a bad ground between distributor and points. Remove them, clean up the distributor base and metal base of points and try again. I use a Pertronics ignitor in place of points and it works great. About $90 bucks at NAPA. You will have to order it, but then setting the points will be a thing of the past. If not a 215 or 235, can still get a Pertronics for other engines with mechanical points.