Car surging

A few weeks ago, my car started surging periodically. I had a scan done, it said catalytic converter. We replaced it as well as used a cat cleaner. It continued to surge. We were told alternator, we replaced it. It actually needed it. The plug connecting it was burnt as well as where it connected to the alternator. It still continued to surge but got worse. We ran another scan; it showed the bias solenoid. We replaced that. It still surged, this time worse and started shutting off while driving when it would surge. We then ordered a new fuel pump and replaced it. The whole time the car starts very easily, has a smooth idle, motor is very quiet with no shake or vibration, it did not cut out at idle. After changing the fuel pump, it seemed to have more power. It did not surge the first two times driving it. I work 8 miles from home and a while ago on the way home three miles from home it started surging, it was not nearly as hard as it was before and never attempted to shut off. It surged about 5 or 6 times and stopped, and I made it the rest of the way home without doing it. It had new plugs and wires put in less than a year ago (about 10 months ago) it has no smoke coming from the tail pipe as well as no gas smell. Please help me, I really do not want to tell my husband when he comes home that it is surging again. Any help would be greatly appreciated.