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there are 2 plugs on each head, they go through the valve cover. get a multimeter and check resistance between the OUTSIDE pins on each plug and a good ground (block or alternator), should be between like 0.1-2.0 ohms. anything more and they are bad.
check relay first. theres detailed instructions in tech files.
i just did this yesterday and replaced 2 and gonna gotta order 2 new plugs.
Fire Lieutenant/Paramedic, Tinkerer
1990 Jeep Wrangler YJ