Would have suggested you do your own wires & plugs, but today, that "skill" is pretty much unknown or forgotten.
The dealer didn't even look at the plugs and wires - the CEL indicated a miss.
It takes me 20 minutes for the front three plugs and about 20 minutes a piece for the three rears. Wires are $60.00 and plugs are $6.00 each. $100.00 and 1-1/2 hours vs. $450.00