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Q: spark plug replacement on 2004 Hyundai XG350

Is it necessary to replace the wiring when you change spark plugs. They are charging me $450 to replace plugs and wiring
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It's hard to believe the wires need replacing on a 2004 vehicle. How many miles do you have on your vehicle? Is this for regular maintenance or is there a problem with engine misfiring? What is their reasoning for replacing the wires?
My car has 219677 miles on it. I had spark plugs and wires done on it at 183000 miles. Yes it is misfiring
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