One problem related to engine stall has been reported for the 2015 Lexus IS250. The most recently reported issues are listed below.
Engine stalls after coming to a full stop and then trying to accelerate. Car will creep out into an intersection, then will suddenly accelerate. This leaves me vulnerable to being hit by on coming traffic. Happens on city streets after coming to a complete stop. Can happen when I am going in a straight line or turning. Happens often, but not always.