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There should be a plastic cover over the cylinder head. Assuming there is no air cleaner ducting located over the top of it, just pull up on the cover. They are usually held in
place by grommets, so just pull firmly upwards to release the cover. The plugs will be located under the coil packs, so you will need to unbolt the coil packs and pull them upward to release them.
you'll need a plug socket and a 4-6" extension and ratchet. I'm not familiar with the engine layout of your vehicle, but that's pretty much the basic layout of a typical 4-cyl gm engine.
 
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