inconsistant acceleration

im trying to figure out what is wrong with my car. some days it sputters like its not getting fuel, some days it runs fine, and some days it just dies every time i stop. i changed the fuel filter, and i thought maybe the fuel pump. but the check engine light came on, and a guy at tuffy said the computer doesnt check if the pump works or not. please help me out on this

[Earthworm]

You should be checking the code generated by the ECU. Instructions can be found on http://svx-iw.com/ (click on Codes)

if anyone has this problem, it turned out to be the MAF. anyone know where i can get one cheaper than 400 bucks?????