Right bank won't fire

[SVXDan]

So I was driving around one day when I lost all power and the car was limping. Was just highway driving, nothing exciting. I got it home not thinking much of it, started it up the next day and it was fine. I made it about 2 miles then it lost all power again.

I checked and the right 3 cylinders aren't firing, they all went out together. I changed the plugs and checked the coil on plug wires, after new plugs the wires seem ok. There is fuel going into the cylinders so the injectors are working.

Anyone have any idea what this could be? Some common component for the different banks ignition circuit or something?

Any help would be appreciated.