Hey CMS i had this happen not too long ago with my 5s , while it may not be related its worth checking into , i was out in my car the night before , came home turned it off . slept . woke up and went to go get my prescription filled and my car wouldnt crank over what so ever it would try but would just make some wierd sound like it was flooded or the starter was dead . i gave it 10 mins or so and it finally turned over idle was extremly high and finally dropped to about 2 grand so i drove anyway . had just enough time to go to the pharmacy and come back home . let the car sit all night and finally it would not turn over at all again and was accompanied by a wierd metal scraping sound and hesitation , starter would still click over but it was fubard.
turns out my coil wire was shot my distributor cap and rotor were both shot . my base timing had been thrown off also , theres a few other things i may need to check the last bill i got and fill in anything im forgetting .
dunno if it will help but it sounds close enough.