Greg,
I've been though this. With 30+ wires from the EC2, 4 injectors, 4 plugs (In your case, 6 & 6), and a CAS there's a lot of places to get stuff wrong. Add this to getting the EC2 tuned right and there many hurdles. I know this because I tripped over a quite a few of them, sometimes 2 at a time which is usually harder. The good news is that you've got plenty of redundancy.

It CAN be done as others have proven. My EC2 (or engine) hasn't as much as hiccuped for the past 40 hours running time.

Keep working at it. You'll get there.
John