Po507 chevy suburban have replaced the iac but nothing

Question

Dont know what else ....no leak , its clean

Answer 1

Do a idle relearn

1. Turn the ignition to the on for 5 seconds

2 Turn the ignition to the off for 10 seconds

Start the engine,and check for proper idle,operation

Try this procidure but clear the codes and disconnect the battery, test drive the vehicle.