I will have to watch my data log again and verify, but I can definitely tell that there is something going on with that 95 z28 flash... The PCM was a Cardone Reman unit, unsure of what all they do with them. I had to move my knock module over, and then i read the PCM to check it out and make sure it was populated with data and then i data logged on first fire up... It'll run just doesn't perform like my old tune did.