some work done over winter

You don't have to unless they fall apart like mine did when I had my spark plugs replaced. Personally I'd say yes if you're taking the covers off anyways, but you don't have to depending on your mileage and the scheduled maintenance interval for the wires.
 
You don't have to unless they fall apart like mine did when I had my spark plugs replaced. Personally I'd say yes if you're taking the covers off anyways, but you don't have to depending on your mileage and the scheduled maintenance interval for the wires.

Truck has 61k on it with original plugs n coil
 

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