Odd drivability issue

[NJ Torque]

Car: 2001 Camaro A4

Mods: Lid, longtubes, cam (232/234 617/598 112+2) SS3600 converter, 3.42 gears.

Car is tuned, idles fine sometimes then idle will drop on it's own after a few starts. While coming to a stop car will sometimes stall but no reason. Not a quick closure of the TB like coming from a burnout, slow driving then a stop.

Ideas?

[ThoR294]

check your IAC for some carbon buildup

[DaSkinnyGuy]

Vacuum leak is my idea, my PCV hose had a hole in it that goes into the throttle body.

[69BirdX]

My 98 did that because the egr valve was bad. But 2001 I don't think came with egr

[NJ Torque]

01 have no egr.
pcv system was removed and changed to an ls6 valley cover.
swapped iac from another car in and same issue.

[ThoR294]

pull TB off and clean out the IAC passages... also +1 to check for vacuum leaks as well.

[NJ Torque]

smoke tested car and found no leaks anywhere

[V]

vss signal good? ted just had a stalling issue when stopping, well at least idle drop. and that's what his problem was. worth a shot..

[DaSkinnyGuy]

Another idea, computer is bad.

[ThoR294]

My next guess is hook up a scan tool and watch it when it stalls. Also, just clean the throttle body/IAC passages anyway ;) lol doesn't hurt to do it!