[BillM]

Coil or ignition resistors; also called ballast resistors are designed to be low resistance when cold and a higher resistance when hot. If the coil resistance is not matched to the ballast resistor, there may be too much resistance when hot. The constant resistance of a standard resistor may drop too much voltage when cold, which could cause cold start problems. It's a balancing act. I think the best solution is to use the proper ballast to match the coil.