My car is not running on all cylinders at idle with a cold engine. All ignition coils have been replaced in the past:
. front: 2011, now have 30k miles on them
- rear: 2006, now have 60-70k miles on them, the rear cover has been modified, no water is going in there.
- igniter unit: 2011
My guess is that one of the rear ones is acting up again.
My question: NGK states that their coils are consumables by stating they hold between 40 and 50k miles. Should I replace all three or just the one I find acting up? How long do they hold in the NSX from experience?