I have an 04 impala that i started tuning for a local and no matter what i command in the high octane tables i doesn't change anything. My 2002 and 2000 gtp both get what i command but for some reason it's not working on this impala. Did i do something wrong? So far we've been changing his timing through the AFRVSspark tables. I tried a "write entire" hoping that would solve the issue and got nothing Thanks in advance to anyone that can help!