I am currently working on 2007 Corvette with the LS7 and had to upgrade the throttle body from 102mm (generic brand) to 103 mm Nick Williams. The throttle body was changed out because the throttle blade was grinding into the throttle bore causing the car to set codes and go into limb mode. NOTE : First time posting!
The current issue I have is hard starting/ if it starts it hunts for approximately 15- 20 seconds. I had to do something I have never have done before to get it to run this good and that was change the ETC area scalar to 3800
Things I have adjusted- start up airflow, air flow final minimum, cranking fuel, start up / cranking spark, ETC area scalar