I agree with the above. If youre not familiar with the 137, it'd be best to find something simplier for a project... That car is a nightmare, and I've had at least 30 of them with symptoms you describe- no one else wanted to work on them
Isn't a single coil pack alone over $8,000? Maybe it was only 5K...
It will be damn near impossible to fix that without the SDS to help you along.
But, to get you started, your CAN network is down, fix that first.