Odd drivability issue
 

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?

check your IAC for some carbon buildup

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

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

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

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

smoke tested car and found no leaks anywhere

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..

Another idea, computer is bad.

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!