Rep Power: 677

Would someone tell me what these readings suggest? The following are voltage readings taken at my fuel injector wire connnectors. This is for a 98 Camaro with a 3.8 V-6 engine. I'm getting a P0300B code with the mil light blinking.

While cranking over the engine:

These are the highest readings from the voltmeter. The voltage was fluctuating up and down.
Current Battery voltage at 12.20 volts
# 1 injector 5.80 volts
# 2 injector 5.19 volts
# 3 injector 4.70 volts
# 4 injector 5.50 volts
# 5 injector 5.72 volts
# 6 injector 4.45 volts

With key on, no cranking of the engine:

These are the highest readings from the voltmeter.
Current Battery voltage at 12.0 volts
# 1 injector 6.22 volts
# 2 injector 6.20 volts
# 3 injector 8.95 volts
# 4 injector 6.22 volts
# 5 injector 7.75 volts
# 6 injector 6.23 volts

Would this indicate possible problems with the PCM? I have checked out each wire from the wire connectors back to the PCM. They all ring out OK. I have read that the voltage to the injectors should not drop more than .2 volts or (2/10ths) volts lower than the Battery voltage. In this case, every reading is far below the required voltage value. What is your opinion? Let me know. Thank you, Tommy.

 
Rep Power: 727

Sounds to me like a bad MAF sensor. Mine did similar when the MAF was bad. It could be sending false information to the PCM which in turn is messing with your injectors causing a pulsing sensation under throttle, and a bad idle.

 
Rep Power: 677

Would that condition cause the P0300 code to set with the mil light blinking? Did you have a P0300 code set with your mil light blinking? Thank you, Tommy.

 
Rep Power: 727

It would set a p0300 code, but im not sure about the MIL light blinking part.

 
Rep Power: 677

I just took another voltage reading. This time I went straight to the negative side of the battery terminal for the ground source. Here is what I got:

Current battery voltage: 12.05 volts
With the key on and engine off:

# 1 injector - 11.67 volts
# 2 injector - 11.69 volts
# 3 injector - 11.68 volts
# 4 injector - 11.69 volts
# 5 injector - 11.69 volts
# 6 injector - 11.69 volts

I think this changes things. So, what does this suggest? Does it look like I have a ground problem? How can I resolve this problem? Or, could the problem be with the PCM? I hope someone out there has the answer. Thank you very much for your support.