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On the top of the engine there is a coil pack that runs along the top of the valve cover. At one end is the electronic control module. You remove the 4 10mm bolts and pry up the coil pack. It will have 4 long plug boots that extend down into the head. Just pull it all up and the plugs can be reached at this time. Be sure to gap the new plugs as they may not be properly gapped from the place of manufacture. Hope this helps!!

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16y ago
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Q: How do you change sparkplugs on a Chevy classic 2004?
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