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  1. J

    spark plug and tune up advice???

    I'm getting ready to do a tune up on my yukon. I'm planning on ngk tr55 plugs and delco wires. Rock Auto sells model#718q wires for $107 and #9718q for $64, is there a difference? Also, does the brand of rotor, cap, pcv valve, etc. make much difference, should I stick with Delco or are cheaper...

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