2 weeks ago the check engine light came on in our 1997 Q45t. A day before that, the car started to hesitate and stumble a little.
We took it in to Infiniti for service. They changed the #1 coil pack and all 8 spark plugs.
The service tech told us that we should replace all 8 coil packs, because once one fails the tend to fail in a domino fashion (one after another). Sadly, all 8 coils would have cost us over $2000!!
The car ran fine for about 5 days, now the Check Engine light is on again and the car is stumbling.
Questions:
1.) Is this a common problem, if so, what is the remedy?
2.) Is it probable that the coils will start to fail in a domino fashion (I've never heard of that)?
3.) How can I test the coils?
Any other suggestions are greatly appreciated.