2002 Pontiac Sunfire sputerr

hi my names chris i have a 2002 pontiac sunfire 2.2 engine automatic umm im not sure whats wrong with it i looked online and it told me alot of things it could be ok i was drive and i just started losing power to it it wouldent evan go past 35mph and that was on a flat up hill it wouldent evan go up a hill evan the smallest hill it wouldent go up evan in first gear online told me and napa and autozone told me the fuel pump so we got one replaced it and it still doing it in park if you step on the gas you cant evan get it to go past 2000 rpm as soon as it hits 2000rpm it boggs out and if you stepp on it it boggs out and still wont go past 2000rpm and then when you let off the gas it will just shut off it will idle but when idleing its like it has a miss and i dont know what to do we looked online and it said coils so tomorrow were replacing the coils to if you could help me it would be great please and thank you im dire need of help im only 20 have a 1 year old girlfriend needs to be at the hospital for sugery by tuesday so i kinda need the car and my family wont help me at all