Chevrolet Repair: Electrical system, catalytic convertor, chevy impala

Question
My car just stops and every thing goes out: the lights; the engine; this usually happens when I.m driving at high speeds 50-70 mph. I stomp on the gas pedal and the last time this happen it engine came back on. I have had the catalytic convertor replaced and spark plugs and wires replaced (tune up) and this problem continues. I believe it is the electrical system or brain box please help. The car is a 2001 chevy impala.  can I replace the brain box and what is it called?

Answer
Hello Aurelia,
I doubt it is the ECM(brain).
It wouldn't cause the lights to go out.
I think you have a loose connection.
Check the battery cables, starter connection, and the connector through the firewall.
Remove the battery connections, and clean the area where the battery and cable metal parts touch.
Van