> The little screws which spear the wires do not make a very good
> contact
> with the carbon core and eventually fail
I agree; first place I'd look. A simple test, worth doing at every tune-up
IMO, is to use your DMM to measure the resistance from the terminal inside
the cap to the connector for the spark plug (cap & wires removed from the
car, obviously).
If you do find a bad wire, best to replace the rotor as well. A bad wire
puts extra electrical stress on the rotor, and a carbon track is virtually
impossible to see.
-- Randall
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