UPDATE: Here is some data that I collected that makes my theories on faulty wiring a little sketchy:

Injector resistance: All 4 ranged between 2.7 and 2.8 ohms. This is towards the limits of the specs (1.5-3.0) but good nonetheless.

Injector power feed: The yellow wire off of the solenoid resistor was continuous to the #1 and #3 injectors (isn't this supposed to be to 1 and 2?). The blue wire (although the splice looked a litte corroded) was continuous and led to the #2 and #4 injectors. Assuming that the solenoid resistor is good, this would mean that the injectors are receieving proper power.

Injector ground to ECU: The white and white/red strip wires both led from the No. 10 and No. 20 pinout on the ECU to a splice where both were put together w/ a butt connector to the 4 injector wires. Checked for continuity between the ECU connector and where the wires were spliced together and it was good (<1.0 ohm). Checking between the injector plugs there was a large variation in resistance. Between the #1 and #2 grounds, resistance was around 3 ohms. Between #2 and #3, resistance jumped to 50 ohms. Between #3 and #4 resistance was about 60 ohms. I am not sure if this should make a difference.

Engine Ground: Checked brown wires from ECU to engine ground point (stud on intake/plenum seam towards firewall) and they were continuous with resistances < 1 ohm.

Does all of this information seem like what I should be getting for a functioning injector system? If that is the case, where should my focus shift?