About 6 weeks ago the fuel pump and fuel filter was changed on 03 malibu due to no start (fuel related) issue. About a week ago the car started cutting off while driving at highway speeds. After cutting off it starts right back up. Problem is intermittent but is becoming more frequent. I am leaning toward ignition switch (not key cylinder) since no codes are being set in the computer.

Does that sound like an ignition switch issue? If so are there any guides on replacing the switch? Is it a do-it-yourself project or does it need to be done by the dealer?