The first thing i would check in is your headgasket, those engines are known for it, i had one customer drive on a leaky one for almost a year. He had the exact same symptoms that your gf has been having. I would also check the ignitor. I would change the plugs one more time just to be safe. But my money is on the headgasket. I specialize in hondas. When the local dealership has problems they give me a call
