Yes, you can run electrical wires in a load bearing wall.
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A 3 wired electrical fixture includes positive, negative and ground. The ground can be attached to one of the screws in the wall. In the case of the other wires, matching the colors, twisting and capping the wires together will handle the electrical installation.
Electrical energy comes out of a wall socket.
any wall 2' or over
Depends on the load of the oven. More than likely it will require AWG #6 but you need to read the electrical requirements for that particular oven.
There could be two reasons. One is that the receptical is old and well used and the connected load is close to 1500 watts. Second is that the wires have become loose on the terminal screws and are arcing. In either case get the receptical replaced right away.