I did this today. First thing I did was disconnect the electrical connector for the Ignition Control Module (the metal thing on the black cover in the top middle of the engine). Then I unbolted the holder for the Throttle Cable (that's the cable that runs over the engine and into the rear fire wall...it can be a bit difficult to get the the bolt, but I GENTLY pulled up on the metal A/C/ pipe over it), so I could get it out of the way. Once that's out of the way, unscrew the four bolts holding the cover/Ignition Module to the engine. Gently pull the cover off; this may be somewhat hard to get off because of the boots over the plugs, they use suction to stay on. Once off, unscrew the plugs (don't use to much force as you don't want to break the plug off). Once off, coat the threads of the new plugs with anti-seize compound and reinstall. I chose to finger tighten them, then a quarter to half turn with the ratchet. Don't over tighten them as you could strip the threads. Once they are in, put the cover back on, making sure the boots go over the plugs, reattach the holder for the Throttle Cable and reattach the plug for the ignition control module...then you're all set! I would recommend getting the OEM plugs from the dealer or a local auto parts store. The ones I got from the dealer are AC Delco Iridiums. The plugs don't require changing until the car has approximately 100,000 miles on it (160,000 KM).
I have also done my plugs today as well, But just remember one thing just because you don't hear the snap from the boots when putting the cover back on dosent mean that they are not on right.( Hold the cover down with your hands using alittle force not to much, Then tap on the cover lightly. Then start one bolt on one side don't tighten it all the way, Then on the other side the farthest away from the first bolt do the same but tighten that one down then go back to the first one and tighten.)
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