[ischmitz]

Yes, re-test and then check if the reading changes due to poor contact between test lead and wire or because you manipulate the spark plug wire. I am assuming you disconnect the wire at the distributor and from the spark plug and measure the center contact at each end, right.

There is an internal resistor in the connector of the spark plug wire that is 3k Ohm. If there is poor contact internally this could cause the meter to jump.

However, even if the meter reads correctly the wires could still have internal issues. Remember the resistance measurements happen with very little voltage and very little current. In operation there is high-voltage and this behaves differently. If can have an internal pathway that only shorts the high-voltage.