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Q: engine idle rough and poor gas mileage on 1998 Cadillac Seville STS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
dealer said I need new spark plug wires but they were replaced about 15k miles ago
(1) Answer
If the wires weren't factory, then they CAN fail in short order. Make the dealership guarantee their work, i.e. if the new wires don't fix the problem, you don't pay. If they balk at this, then they are guessing and take your car to a shop who will stand by their Diagnosis AND repair. I always do at my shop.
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