a 1457 is an evap leak the there is only one thing that i have seen that will cause that and a car to stall...with out actually diag work ill say that your pcs(purge control selinoid) is bad.....but since u didnt tell me what kinda car u have i cant tell u exatly where it is...i can tellu its under the hood and has a vacume line goin to the intake...hope that helps