OG sensor?

What is your question?

My car has this really weird jerk, for instance when i'm at a stop light it seems as if my engine is jumping, and it kind of have this weird sound as if my car is going to shut off, which it will do if i dont immediately hit the gas after the light is green.....I was told it's the "OG sensor" I'm thinking of getting it replaced but i want to know for sure that this is what's wrong with it. Some mechanics here try and get over on us females just to get money. I was told that my converters were bad and if i had them replaced then the rattling in my tail pipe would go away which it didn't after i had them to replace it.