idle/start problem. Help!

Hi, my name is Jason and I'm new to this forum, and I need some help with my 96 GT.

Yesterday I was driving to school and when I left the curb in front of my house it hesitated a little bit, but then it was ok. Then about half mile farther down the road it started lurching wouldn't respond when I gave it some gas. So, I put the clutch it and tried to rev it up and hoping that would help. But, when I put the clutch in the RPMs just dropped to about 500 and was running rough shaking the whole car. I gave it some gas and tried to get the RPMs back up, it still ran rough, but the RPMs did come up a little, but then dropped back down and wouldn't come up no matter how much gas I gave it. So, I pulled to the curb, left it running and popped the hood hoping maybe I could see something or at least be able to hear it better. It was still running really rough shaking the car until it finally died. I started it again and it barely ran at all, shaking the whole car and barely staying running. Finally it died and wouldn't start again.
So, I got it towed back to my house. This morning I went back out to try and see what I could find out. I tried to start it and after a couple of tries it started but still ran really rough and wouldn't respond to any gas I gave it.
Thats all I've done so far, I'm just a college student so I dont really have the money to take it to the shop. Here is what I've checked so far:
When I turn the key on there is a whine coming from the gas tank for about 2-3 seconds, I'm assuming from this the fuel pump is OK. I then checked the fuel rail shrader valve and there was pressure and when I pushed on it gas came out. I replaced the mass air flow sensor about 7,000 miles ago. I replaced the wires and plugs about 4,000 miles ago. My engine has 139,000 mikes.

Thanks in advance for any help!!!

Jason

I haven't done anything to it yet. I'm thinking of replacing the fuel filter though.

Yes I do have a check engine light on, but it has been on since I bought the car, Auto Zone ran the trouble code on it and told me that it was a smog sensor of some sort and that it wasn't any big deal. It is possible that it has thrown a code since then, but I wouldn't know if it did.

Jason

Thanks everybody for the responses!

Heres what I've done so far since yesterday...
1. I replaced the fuel filter
2. I rented the obd2 scanner from Auto Zone and got 4 codes. I think they are all related to the emmission sensors. I wrote them down but lost the paper I wrote them on. 1443, and 0130 are the only ones I can remember. Still I think they are the same ones that it threw a couple of months ago.

But, when I replaced the filter no fuel came out of the lines on either side of the filter. And when I tried to start the car afterwards nothing happened at all. After trying to start it a couple of times I went back to the fuel rail and there was no pressure behind the shrader core. So, I'm back to thinking that it may be the fuel pump?