My car stutters while idling and accelerating?

I was driving my car today when all of a sudden it began to stutter, first while idling, then while accelerating. When at a complete stop, the car idles high and low, and stutters like it's about to shut off. While accelerating, it stutters, and barely moves, then gets to a point where it doesn't move at all, and I have to shut the car off. It's a 5 speed manual, and I have had to change the O2 sensor for a while now, so my only idea is it's that. Any other possibilities it could be doing this?