Coils should be pretty low resistance. Generally speaking it is pretty much a binary thing. It is either good (small resistance) or bad (open circuit)
A dirty connector can decrease energy through the coil. But coils themselves, like a like bulb, are good or bad.
The coil on my old jeep went just as I was pulling out a of a pizza shop with hot pizza to bring home for the family. Called the wife and she strapped me home before the pizza got cold. :D