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You have to remove the plug wires, you can remove the battery and washer fluid tank to gain more room. You will also remove the air box and intake pipe. I use a spark plug socket, 3 inch extension, swivel socket, and an 8 inch extension, the swivel makes it easer access and to turn your socket wrench.
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If you find oil on the spark plugs or boots, your tube seals are leaking and you will need to remove the valve covers to replace them.