My 2008 Ford Taurus X, 132,000-miles, twice now has stalled. First, it was very slowly cruising in a parking lot. The second time was at a stop sign on a steep hill. It died when I went to accelerate. Both times restarted right up. Checked battery and alternator, test said fine. Nothing else seems to be wrong otherwise. (Except for the AC unit has a part dying, though I don't see that having a connection.) My next thought is the fuel pump? Suggestions, please.
Usually, a stalling issue on deceleration or when reaching a stop points to a problem with the IAC motor, MAF sensor or vacuum leak. If this only happens when the AC is running, there could be a problem with the computer not getting the proper signal from the AC. If the engine starts right up after it stalls every time, then there's an electrical problem, probably from a sensor or a sensor circuit. Check first the IAC motor and MAF sensors. This other post may help you here:
Updated on July 8, 2019
By Dan Ferrell