My fiancée’s 2017 automatic ecoboost, 50k mi, started stalling out when we were at a stoplight last night. The first stall was immediately preceded by a sudden, incremental drop in rpm from idle. We put it into park, started it, then it repeated the drop to a stall. Another start up and giving it more gas and immediately putting into drive (light turned green), kept the engine going but air:fuel was in the 13.0-13.8 range on the dash. A stop at a light 1-2 min later did not reproduce a stall. There was no dimming of any lights before the stall. She runs pretty much only 87/regular from a gas station chain I will not stop at (Spinx). I use 93 in my 2015 2.3 with 47k mi and have only had rough idles when I previously got 93 from a different Spinx location.
Now that I got all of that out of the way, has anyone else had an issue with a 2015-2017 ecoboost automatic stalling out?

 

I’m about to run some fuel injector cleaner through it, have her only use 93 from a different station for a few tanks and see if that helps eliminate the issue. There is a wrench code but I don’t have a reader and haven’t gone to a store or shop yet.
I originally posted this under a different “discussions” section but afterwards noticed that section is seemingly dead.

 

Fuel injector cleaner probably won't do anything on newer car. Fuels have additives already in them and as long as you're running name brand gases you shouldn't have any issues.

I'd look at the throttle body plate (clean it) and the Intake (MAF sensor) (clean it too).

 

Here’s an update since I last was here. The issues on the 2017 self-resolved after I had my wife run a few tanks of only 93 and we stopped using that company’s gas station. We occasionally get small rpm drops and brief idle roughness.
Curiously though, once my 2015 ecoboost got into the same ballpark of around 52,000 miles, it started having similar issues with a very rough idle including significant rpm dips nearly stalling the car which triggered a cel to stay on constantly. It turns out I had a bad evap canister purge valve that, once I replaced, solved that and cleared the cel code.

 

Another update: I jinxed it. 1-2 weeks ago my wife’s 2017 mustang lit a CEL with p144c as the code at just over 60k mi now on the odometer. It was showing the same code stored twice before this in the computer when we plugged in a reader. Evap purge valve canister replaced, just like in my 2015 a few months ago.
Google shows tsb’s for other ecoboost-equipped vehicles but i didn’t see one for 2.3 mustangs