Blinking engine light= really bad misfire situation. Possible hydrolock. If your engine light blinks turn the engine off right away. Park it and get a tow truck.
agreed
Why is it hard to believe that this could be damage from a stock tune? the 11-14 had issues with the stock tune mustangs losing the #8 cylinder. My mustang '11 had a cam phaser failure that totaled my entire engine around 5500 miles. My car was completely stock down to the tune, but it still let go. Shaun from Aed posted a while back that there was an inherent problem with the ford stock tune. people didn't usually have problems as long as they didn't stay WOT for more than a few seconds. I believe the ford tune problem would show up if you went WOT for around 7 seconds or more. I'm not saying this could possibly be something else, but to say that this is impossible to happen under stock form is insane to believe.
and agreed