It seems that the more things I "fix" on this car, the worse it runs. Since the most recent work (described below) the car has run very poorly, with rough idle and poor or nonexistent acceleration from a stop.

Is this system designed to open injectors 1-3-5 or 2-4-6 as a group? With the cold start valve disconnected, it seems that only injectors 2-4-6 are working:

- The car starts and runs (poorly) with injectors 2-4-6 connected and 1-3-5 disconnected. Disconnecting 1-3-5 has no effect on idle or performance.
- The car will not start or run when 1-3-5 are connected and 2-4-6 are disconnected.
- Disconnecting any one of 2-4-6 causes the running engine to stop.
- When working the throttle, the throttle position switch causes injectors 2-4-6 to "click" but injectors 1-3-5 remain silent (is this normal?).
- Connecting the wire for injector 2 to inj. 3 results in "clicking" from inj. 3
when working the throttle.

Is it possible that there is some problem in the wiring (insulation on which is dried out and failing) or circuit that would cause this? Am I in for a new ECU? Does anyone know where I might find one for a reasonable investment?

More info:

I recently replaced the distributor, replaced the engine temp sensor (and repaired the wiring which had become shorted), and inspected the auxiliary air valve and found it to be working. I measured the fuel pump pressure to be 30 psi. I measured the resistance for each of the injectors at 2.5 ohm.

Following this, the car was running rich and would not start when warm unless the accelerator was pressed to the floor. I suspected the cold start valve was leaking or on all of the time, and confirmed this when I found a pool of gasoline in the intake manifold under the throttle body. So I disconnected both the fuel line and the electrical connection on the cold start valve.

Concerned that I may have a vacuum leak somewhere, I also disconnected the vacuum to the dashboard systems.