Correct me if I'm wrong but the IAC only works when the engine is cold. If the stalling is happening while the engine is warm then it's not the IAC. It could be a vacuum leak or it could be in the tune, stall saver timing, fuel cut on decel, etc. Sorry to say Omar but this is where it benefits you to have a stand alone ECU like Stinger or Megasquirt, we (err Steve) could help you out with that. Another benefit is being able to plug a laptop in to your ECU and seeing all of your system information for analysis.