I have a 97 Honda Civic EX coupe AT. It started sputtering not to long a go. When driven for more than 15min it will start sputtering like it wants to turn off. It has turned off on me a few times when I have driven it across town. If I have driven it for awhile it won’t turn on sometimes. The battery is good and the alternator is good. I have changed the plugs, wires, and the coil and I still have the same problem. Does anyone know what it might be?