One other heads-up- - - -a coil can pass all the resistance tests and still have problems. An open circuited (or very high resistance) plug wire can make the coil fire through the insulation between the primary and secondary windings, and create a path for a future miss. Eventually, it will develop a carbon track through that hole and the miss will happen more frequently. Ohm checks of both windings WILL NOT show up the problem. I have taken more than one problem coil apart and found those holes and carbon tracks, so I'm not just spitballing that theory. A HEI coil can develop in excess of 50K volts on open cirtcuit, and that kind of voltagbe can make its own pathway to complete a circuit.
Jerry
