Just to be clear you need to twist off and cut 1/2 inch off on both ends of the plug wire. The coil connection works the same way,twist off,trim,re twist it on. I have also seen wires break off the solder joints on the stator causing intermittent spark. Once you get the flywheel puller it's worth a check. A simple "continuity" test from a multi meter will ring and let you know if the grounds are connected. Just put one lead on a bare spot on the frame and touch the other lead to the ground terminal connectors/wires.