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The 3.5 V6 has individual coils for each spark plug. There are of course 3 on each side. They look like little black caps with a wire connector plugged into it. They are held in with two screws each. Un-plug the connector from the coil and remove the screws. After you do that, the coil will be easily pulled out. Down inside the tube where the coil was, is the spark plug. Most of the plugs should be easy to get to. You will need a ratchet extension and possibly a universal for one of them along with your spark plug socket. When installing new plugs, use an anti-seize compound on the threads of the plugs. Don't over-tighten. Get them in good and snug, but don't crank on them. NGK plugs are recommended for this engine, so be prepared, they're kind of expensive plugs. GOOD LUCK.
My 1998 3.5 just turned 175k and I put the 3rd set in.
I bought Denso plugs at a local autoparts store - not the chains.
Wasn't really worried about the price, but Denso was significantly cheaper than Bosch Platinum & NGK.
I could be wrong, but I think Denso may be OEM.
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