ugh!! camshaft positioning sensor or o2 sensor?!?!

Ok, Here goes,As u can see my car is a 95eclipse gs (hince my screen name)..Ok,My rpm's jump between 2k and 0 while my foot is on the gas,When my foot isnt on the gas it stays normal,Well i can no longer drive my P.O.S. because of this problem,I took my car to autozone for a diagnostic test,(not sure if i spelt that correctly but you know what i mean)The guy at autozone said three things were sending out errors,#1..Ignition coil,#2..o2 sensor..#3 Camshaft positioning sensor..Well hell...i just spent 80$ on a ignition coil,Knowing my luck it didnt help one dam bit!!!!!So..i spent 80$ for nothing,Ok so heres my question, If you dont know it already,WTF is going on with my car? Anyone know? Im not trying to spend money on something i dont need!.

Please if anyone knows which one of the two things left sending out errors (camshafts positioning sensor,or the o2 sensor) could be making me have this problem,Let me know please.. Thanks!