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Replace Spark Plugs?

How do you know that it is time to replace spark plugs? I own a 1989 Frod Bronco II 4wd, 2.0 liter engine.
Carmen Life, November 2006
Usually car is running a bit dodgy or has starting trouble. To check, remove one, and look at the ceramic and terminals. If they are black/oily looking they may need changed. If they are brown theyre fine.

Paul, December 2006
link Click here to see other fixes for Bronco.