Quote from Deleted user on July 13, 2018, 8:39 am

Looking over your 2 logs, it is my opinion that the system is working properly.  The low vacuum is confusing the Ecu.  I could be wrong, but not right there with you.

Your IAC steps look good.  May be a little low.  The consensus was 5-10, but now it is often suggested 10-20 at operating temp.

You could try putting your hands over the air horn. Slightly restricting the air flow through the unit.  Watch your vacuum as you try this.  If it starts to run better and vacuum increases, you have a vacuum leak some where.  When you cover the unit completely, the engine should immediately die.