Do you have the blue wires with screw on resistors or the one piece black ones? If blue, screw the ends off, check eack end individually. The wires are copper, soi they don't fail. Plug end should be 5k ohms, cap end 1k I think. If they are the one piece wires, they should be around 2-3k ohms per foot. If one is higher, check for corrosion in the ends, then with the ohmmeter connected stretch the wire gently, and wiggle the ends. If you can stretch it, it is probably burning out internally and the resistance will change. I have seen wires missing upwards of an inch of proper conductor- burnt to carbon from internal arcing.

If you have any doubt, just put a new set on. An open wire will cause the spark to find another path to ground, usually by burning a carbon track onto the cap. On a distributorless ignition it will usually burn the ignition control module under the coils out, making $50 for a new set of wires seem really cheap.