OK, here is the update. Using an LED: (1) All injectors are getting the signal from the ECU. (2) Connections 3,4,5,6 (injectors) & 13,14,21,22 (trigger points) in the ECU are OK.

When I checked the signal at the injector connections with the ignition on and moved the throttle linkage this is what happened: (1) Two pairs of injectors were always getting a signal, not just one pair, is this correct? (2) Also,there are six possible combinations when two pair of injectors are getting a signal at the same time, but only four occurred.

These combinations occurred: 1,5 8,4
1,5 7,2
3,6 7,2
3,6 8,4

These did not: 1,5 3,6
7,2 8,4


Should I pull the injectors?

Please help with the next step. -Mike