gidpor, recommend that the distributor cap and rotor be inspected and cleaned every 30k miles, possibly replaced every 50k - 60k miles. Spark plugs should be replaced every 30k miles. Ignition wires should last for 100,000 miles+ if you use Beru or Bosch ... depends somewhat on how many miles you drive annually. If you only drive 5k miles per year the wires probably won't perform effectively for 20 years.

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Fred Hoelzle