Kristen Pennie

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Kristen Pennie
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Free CDL Pre Trip Checklist | PRE TRIP INSPECTION SHEET Driver Date Vehicle Route

Free CDL Pre Trip Checklist | PRE TRIP INSPECTION SHEET Driver Date Vehicle Route

(Image by OnAllCylinders contributor Lori Sams)

Your spark plugs are like a cipher. And to read a cipher code, you usually need a cipher key. That’s what this is—a cipher key that is going to help you “read” your spark plugs and understand what …