my obd II

I had a obd I scanner "auto-x-ray" and just sold my 94Z and bought a 96 SS I now need the plug for the OBD II anyways. I reiceved code 15 service engine soon light bliinked that many times, that went away and then gave me new codes blinking 8 and then 10 times. I am unsure what this means. There is some serious vibration from my m6 in 5th and 6th gear. like when you shift into those gears when you are not going fast enough. As if the engine is not reciving enough gas. My car feel like it is under power in the 1-4th. Any response with this experince would be helpful

Thanks for reading
brian

1. You can't read the diagnostics codes by way of a flashing light. 1993 was the last year that could be done.
2. Codes will have to be read with either an OBDII code reader or scan tool.
3. Autozone can pull OBDII codes. It's free. Go there, have them pulled, and ask for a diagnostic printout.