Check out this VIDEO from scannerdanner.com on how to check the coil and Igniter with a test light and volt meter and a scope for input and output pluses. Scroll down the page and look at the drawing of how it is wired.
If there are no pulses into the Igniter on one of the wires, you will have to trace it back to the ECU.
That is it. Upper left corner in photo.
The ECU sends signals to it and it controls the coil. There are two power transistors inside of it that act like high speed switches. One transistor controls the front coil in the coil pack (cyl 1 and 2) and the other one controls the rear coil (cyl 3 and 4).
They seldom go bad, but 95% chance it is your problem.