I'm having an issue with the timing it does not follow the main spark tables. I have zeroed out the IAT, AFR and ECT spark correction tables. It seems that something is retarding the timing and reducing it by approximately 6 to 7 degrees in all areas except the idle. I also zeroed out the burst knock retard tables thinking that may be reducing it Can someone look at my tune and see if they see what may be causing this? This is a 2001 Yukon XL with a 6.0 and lysholm 2300 Supercharger running a 2 bar OS SD tune no MAF. Thanks for looking at it and any help you can give me.