[crazeddriver]

I was just checking out my car today and i was looking in the engine bay and i realized something. My O2 sensor was not hooked up but it ran fine to me the last time i drove it. Maybe it feel off after i drove it, it has been a while since i drove it. But would it just have made me lose power or whould it run rough? cause i thought it would run rough but i don't know can someone please give me an imput? thank you.