2007 1500 Avalanche with a 6.0 swapped from a 2011 2500 HD Silverado.
I used a 6.0 file from the repository for a 2010 2500 HD Silverado. I kept my TB because the TB on that engine was damaged. Kep all 5.3 TB values. All is well except for idle. The car had a surge for a while. Adding idle airflow does not change a thing. Today I almost maxed that out and the car barely raised the idle RPM to a 1000. My next step is to replace the TB. Could it be the culprit here?