Did you switch to a MAF style reluctor ring in the distributor when you applied the MAF kit? The MAF computer will want to see the shorter "signature PIP" in order to fire the injectors in the correct order. The batch fire truck dizzy does not have this feature -- all the PIP pulses look the same. Mismatching the reluctors in this way may cause some injectors to not fire...

From your other thread -- if you probe a connected injector on a stopped engine, you should see 12 volts on BOTH pins. One pin gets 12 volts all the time. The other pin is grounded by the computer in order to fire the injector. When the computer is not grounding this pin, then the injector will feed 12 volts across from its input side, and you will see 12 volts on both pins. If you start the engine, one pin on the injector should remain at 12 volts, the other should flash as the computer alternately grounds and does not ground the pin.

If you remove the connector from the injector, and then probe the connector, you will see 12 volts on one side and "0 volts" on the other. What you are actually seeing (on a stopped engine) is an open circuit, with nothing connected to either end of the wire. The injector is not feeding voltage through, and the computer is not grounding the other end.

If you probe a disconnected injector connector on a running engine, you will STILL see 12 volts on one side and "0 volts" on the other, all the time. Without the 12 volts feeding through the injector, that pin will read "0 volts" when the computer is not grounding the injector (because of the open circuit), and it will read "0 volts" when the computer IS grounding the injector (because it pulls it to ground).