so what happens is that when driving I put it in neutral and the car idles at 1500-2000 rpms then when the car completely stops to goes back to normal but it takes like 3 seconds. I have an m6 ls1 with a 102/102 with original iac sensor.

 

You need a retune with the 102. It has totally different airflow requirements. You're getting the "cruise control" effect from having too much base running airflow. You need less with the 102.

 

Okay I'm getting it tuned tonight. So hopefully that fixes it.

 

I just got my car off the dyno and it started this same thing on the way home. It's kinda intermittent. I have hptuners so I may have to go back in and look as we'll.

 

Same problem. I'm going to check the voltage at the set screw on the TPS to see where it's at. I believe it should be .6 volts... It that's set properly I'm considering drilling a .157 hole in my fast tb blade.

 

You were right it was the tune thanks