Inconsistent spark, misfiring, etc., etc.

[MadPSI]

I decided to finally replace all the injectors in my '90 and now I've come into other issues. The car sounds like it's missing really badly. I replaced all 4 injectors, cap, rotor, plugs, wires, and set the timing back to stock. I put the timing light on each of the spark plug wires to see if I was getting power to all cylinders, but I found another interesting issue.

The wires for cylinders 1, 2, and 4 all show a very consistent spark with the rhythm of the motor. Cylinder 3 seems to spark totally randomly. It will spark rhythmically for a few seconds and then it just seems to go ballistic, almost like putting the timing light on main cap wire...

Anyone else have this issue? How do I fix?