1991 Pontiac Grand Prix Cut-off and Stalls

Ok. It all started about a week or two ago on my way to a Bulls Game. I got on the expressway and as I was comin down the ramp my car cut-off, Stalled, started back up, then wheni tried to take off it did the same thing again. Finally it started moving and was really quiet!

It started 2 cut-off while I was driving but when I looked at the RPMs it was idling but not in gear. Once I put it in neutral it cut all the way off and start back up fine and jump back in gear once in drive.

Then my battery totally died WHILE I was driving home from work (I noticed the lights getting dimmer and dimmer as I drove then it jus stopped when I stopped) and I was stuck for about 2 hours then it miraculously started back up and I made it home.

The next day it stalled in front of my house and refused to start. I got it started and it cut-off at least 8-10 times on my way around the block to park it.

I went to start it and it would run for about 30sec. To a minute, lights would dim, and then it made a weird sound and then cut-off.

I replaced the BATTERY and the FUEL FILTER on it and it does the same thing still.

DOES ANYONE KNOW WHAT THE PROBLEM IS AND HOW MUCH IT MAY COST?