I was trending my truck today on the way to a side job. I was trying to figure out whey my ignition was retarding almost like clock work, i noticed at the 8:45:45.652 mark that when i turn my AC system off that it stopped. Im new to tuning so was interested if y'all could take a look at it and tell me if there is something in the spark retard file that needs adjusted. I haven't changed anything in the tune except tire size, all other parameters are as found. I was told it was tuned but i couldn't tell you what has been changed.
Vehicle is as follows
2000 Chevrolet Silverado with LM7 5.3 Stock everything but intake tube tune.