coil pack could prematurely kill the plugs. pull them again and see what they look like? look over the coil pack for any discoloration, wear, abnormalities.. You would not be the first with a bad coil pack, even on the newer model..

if everything looks fine try having them run live data and riding with you, if the o2 or something acts out of range.. you will see it.


have you had any work done to the car before?