Little update:
I took her around the block, in order to some how "break-in" the new ETA, so when I punched the gas pedal, the car automatically went from 4 cylinder cavalier to 67 camaro with straight pipes

(keep in mind it was around 9pm sunday nite lol)
So I took it back to my garage, look underneath the car, and noticed my exhaust pipe was split in 2 pieces... in the next 45 minutes, I pulled the exhaust in order to bring it to my work to get it welded and I noticed that the o2 sensor had 3 wires hooked up...
I was confused by this because most of the time, it should have either 2 or 4 wires (2 wires = signal, and 4 wires = heater circuit and signal). Long story short, It idles better but yet still got hick ups, like I would be coming up on a stop sign, idles fine, next stop sign it will run rough...
As of right now, I'm busy (moving, school, work) so I can't really work on the car, Im still going to look for vacuum leak with my home made smoke machine... I'll give that a try and let you guys know how it works out