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the spark plugs are located in the head. you must remove the upper half intake manifold first, it has three bolts 12mm. then remove the black plastic cover down the center of the valve cover, six 10mm bolts. remove the two coils and plug wires. now you have access to your spark plugs. Good Luck
I posted this solution for this same engine on the 2001 Kia Optima. It is Exactly the same 2.5 V6, and the instructions are exactly the same. I recommend replacing the plug wires. Please see 2001 kia Optima for the rest. Good luck, it's fairly easy.
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