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spark plug ngk champion

  1. General Tech
    :confused:a friend emailed me these questions. I must have mislead him thinking I was a wrench. Here it is: I’ll be changing spark plugs on my buddy’s 02 Jeep 4.0L and the manual says to use the NGK plug at a .040 gap. :blah:I went tooling around on the web last night and a few guys claimed...