Help-Help-Help

I have a 1992 chevrolet lumina 3.1 motor. the car runs great but it only does for about 5 miles then stalls like it ran out of gas.... when tries to restart it will fire but wont start. it will also crank very fast then drags down like on the older cars when the timing was to far off. can anyone help me with this problem. i have replaced the coil pacs and this did not resolve my problem... thank you

You need to check fuel presrue when it dies, 37 psi, then check for spark at the plugs, basic diagnostic steps.