Trying to dial in the maf and wanted to double check I have set up right to force it into open loop. Drove around several times until the error was all 1.5% or less and then put my final airflow frequency into my normal tune. But at the track my afr still seems off running a slightly lean for some rpm then too rich for the rest. I tuned my truck all myself off of the oringal 5.3 base tune to run my 6.0 so bare with me.