The plugs are under the aluminum cover at the center of the valve cover. You need to remove the intake crossover pipe, then the cover. There are three coils under the cover. Each coil feeds two plugs. The plugs are way down in pockets in the head under the coils. Be careful with the wiring to the coils. Examine the harness. The harness gets brittle with time and may need replacement. Not cheap.
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