You might look at what RPM you are shifting from 1->2. As the other poster said, 1->2 stalls are uncommon because the vehicle is in motion and the power from t

You might look at what RPM you are shifting from 1->2. As the other poster said, 1->2 stalls are uncommon because the vehicle is in motion and the power from the forward inertia coming up the drive train into the engine is frequently enough to spin the motor, even if its shut off. However, if you upshift too soon, the engine with the 2nd gear ratios will be spun too slowly for the engine to pull itself out, and will instead drag the car to a stop.