So my engine light was on for like a week because i didnt have a chance to get it checked. When I finally get it checked i get the codes p0300,p0133 and p0102..(i think...the papers are upstairs). but then the light went off...came back on for a day then went back off so idk if I should buy the new O2 and MAF sensor or wat?

I would check the wiring on those items.....Maybe they are close to coming unplugged or something might have a short in them..... As far as the MAF sensor.....Get you a can of MAF sensor cleaner. and clean the wires that are on the inside of it. Hope this helps.

Looking at the codes, this is what I see. The MAF sensor is reading low, your then getting a misfire and that'* causing a problem with the O2 sensor. The problem is most likely with the MAF sensor. Clean it with MAF cleaner. If no improvement, then check for vacuum leaks.