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One way of testing is popping the hood after dark and looking for arcing (sparking) between spark plug wires and engine. When looking for symptoms suggesting wires need to be replaced. If your car is missing or jerking under loaded conditions, i.e. when you are driving hard, like up a hill or attempting to accelerate quickly, then your wires may need replacing. If your wires look cracked in places or have wear spots in them, replace them. Some would suggest if you have over 100k miles on your car to replace them, but this is not necessarily a sound method.
James
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∙ 12y ago
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