1997 Toyota Camry Spark plugs

Engine Mechanical problem
1997 Toyota Camry 4 cyl Automatic

Changed my spark plugs and wires, car started sputtering again, a mechanic said we had to use double platnum on it and could not use universal plugs, that it burns the wires. Is this true? And they said it was plug #3. Is it numbered left to right if your under the hood looking at the engine? Thanks