Guys,

I installed 03' LS1 engine on an old car, I also upgraded the PCM to 03' operating system (12225074). I can't do crank relearn, and the car doesn't move right and the timing fluctuates from 9 to 22 in idle.
The trans is an old one and not connected to the pcm, and the OS is set for manual in order to avoid any cal confusion.

Do you think that the crank relearn will cause this problem? if not, would you tell me what would cause the timing to play that much??? And is there any thing can relearn the crank angle manually?