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The other 4 plugs are under the intake manifold. Look closely and you'll see them in there, laughing at you and taunting you to remove them. They're not that bad, but it does take a little time to replace them.
My 03 Mazda B2300 has the same Duratech 2.3. There are only 4 plugs and they are on the top of the engine. I think they abandoned the 8 plug setup in 2000 when the Duratech replaced the older 2.3.
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