Yes there are codes for a faulty IAC
, but I don't remember anyone posting any over the years & my Ranger never set any IAC
codes, but cleaning it's IAC
cleared the problem for about a year, then they returned, so I replaced it.
Before throwing another IAC
at the problem, I'd try testing & or removing & cleaning it as Chartmaker suggested & see what happens.
I have heard of another scenario of engine stall when coming to a stop being caused by the torque converter not unlocking. Sorta like coming to a stop with a straight drive & not pushing the clutch in. You can test for that by quickly shifting into "N" when you feel that the engine is about to stall & if it doesn't stall, suspect the torque converter isn't unlocking.
When this scenario begins to happen, the driver should feel the engine surge as though someone were mashing on the accellerator, as the IAC
tries to maintain idle speed, so they'll have to mash the brakes harder to stop.
So, you might question the Daughter if this surge feeling has happened when the engine stalls while coming to a stop. If not, suspect an IAC
More thoughts for consideration, let us know what you find.