blue97gt

Hello all. I was hoping i might be able to get some help. i have a 97 gt that is driving me nuts! ok well it will turn over but will not stay on. i have been told it could be the idle air control vavle, but am not sure and do not know how to trouble shoot it. the car has about 75,000 on it and i received it at 49,000. when i got it i gave it a tune up and around 60k i replaced the fuel filter. any help would be great. i don't want to have to send it to a mechanic. thanks in advance.