Can someone help me mods as below. Idle surges sometimes not all the time 2 or 300 rpms. And sometimes it will do it in drive but not neutral or park or vise versa. Also, it has been doing it since before I got my ls6 intake put on, and has continued to do it after. Mods are below in the sig. Ive cleaned everything Mass air, changed fliter, fuel filter.Also, I sprayed carb cleaner around intake and hoses to see if it changed the idle it did not. It's really starting to bother me Id appreciate some help from someone? thanks guys I thought it might be a intake leak but the chances it is on both intakes is slim I think.. any other ideas appreciated.. I cleaned the IAC as well

 

Is it doing it becuse the ac or defrost setting is on?

 

It does it both if i turn the AC off or on or whatever I do. Its real random

 

do you have a different TB on there? maybe a ported and polished one? I would check all the vac lines, could be some small little vac leak.

is the car tuned?