how do the wires go in the tune up?
Once you know what size engine you have (on the emissions sticker under the hood), look it up online, such as "spark plug wiring for "wxyz" (year of your vehicle) Ford Explorer 4.0" and something should be out there.
I have four explorers beginning from 1996. The firing order is listed on a sticker under the hood, usually by the hood latch
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