Im not sure which temp sensor was tested, I'm not sure how he knows the spark plug wires are ok.

Im not even sure you know what code or codes you have. There is nothing, nothing on the engine that will make it dump fuel to the point of a misfire. Temperature sensor or otherwise. If you are dumping fuel, and continue to misfire, your cat will be toast.
The o2 sensor, air intake temp sensor, and the map sensor work together to get the right air/fuel mixture. The only things that will cause a misfire without setting other codes to point to the exact problem will be coil pack, plugs or wires. Typically if its a single cylinder misfire, p0301, p0302, p0302 or p0304 it a single cylinder issue, which is a fouled plug. If there is 3 codes, p0301, p0303 and p0300, or p0302, p0304 and p0300 its on side of the coil pack. If there is no codes but the p0300, or all five codes are present it is most likely the spark plug wires. If your mechanic pulled off a wire to test it, its probably now a broken wire.. I can almost never get every deep socket wire off an engine without stretching one of them..

The only thing that would allow the car to dump fuel would be a stuck injector. Odds of all the injectors dumping fuel is slim.. If you have a computer that read the temp, did it read the o2 sensor levels? is it running rich, i.e. dumping fuel? Is it idling high? any signs of too much gas other than a misfire?

since you have a live data computer to hook up to read the temp sensor, What are the codes?