My 2000 Lumina starts to act like the transmission is going out by making a bumping or knocking sensation only after it has been driven awhile and gets hot.
I was told it was an advance vacuum sensor but can't remember the other one but that the transmission was not going out. Does anyone know about these parts?

Your question is really tough to answer because there are literally hundreds of parts in a transmission. You should really take it to a transmission shop. Nothing good ever came of an inexperienced person working on an transmission.