I am working on an '01 K2500 with a 6L and 4L80E (OS 12208322). I have added the lean cruise CAX files and copied the parameters from an '01 Holden tune that I got off of Holden Crazy. Unfortunately, so far, it doesn't seem to work. I have only done a calibration flash after making these changes. Do I need to do an OS and calibration flash instead?