RepairPal is your advocate for car care advice and guidance

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

dealer said I need new spark plug wires but they were replaced about 15k miles ago
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
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.
Didn't find what you were looking for?