I have a 2004 Cayenne T with 38K miles on it. Getting close to the 40K service and had a few questions.

1. I have a feeling my ingition coils are going. The car has a tendency to idle rough and also, just yesterday, the car began to shake quite a bit on acceleration. Guessing this is a problem with the coils? The check engine light came on yesterday as well...

2. What are the standard service items for the 40K? Is there anything major I can expect to have to replace? Fortunately, I have already done the drivetrain...

Thanks for any feedback you all can provide.