I had a issue in nuetral with a set of older MSD spiral core wires, they ohm tested well but ran like crap on a new motor, wouldn't idle and a bunch of other symptoms. I had ran those wires on my Duster and replaced them with a new set before selling the car last year, I had a older MSD 7C box on the car, the new car has a MSD 7AL2 box, it is different internally than the older box is so I replaced them with a new set of spiral core Taylors I had in stock and all was good, remember the coil wire fires on every RPM, not every eigth RPM like the spark plug wires carry Ohms is one consideration on determing the abiltity of a conductor to carry a load, conductance, MHO, is another factor as well as impedance That little tiny stainless steel wire wound around the graphite coated nylon main conductor can be misleading on testing