1997 Subaru Legacy Outback dies while driving (start back up), does not die when idling.

What would cause the vechile to die randomly, while driving? have check all ground wires, coolant, spark plugs, air filter, and changed fuel filter. no check engine lights come on.
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Also have code PO136 and PO500 would either one of these codes be the cause of the car stalling out?
I don't know about the codes but remember that the 1997 had a problem with knock sensors that would make them hesitate. The fix included remounting and/or replacing the sensor.