1991 Sunbird "Sometimes Starts and runs Sometimes Not, Stalls sometimes too! HELP

[Wild_One]

Hey Everyone...or Anyone....

I have a 1991 Sunbird Convertable, 2.0L....Have a problem that is driving me crazy.....The Car will start...run for a bit..then Stall...won't start....and then starts...Really driving me nuts...I have replaced the onboard Computer...the O2 sensor...I was able to get it running by Banging the Fuel tank...Had some say it was the Fuel Pump...So, the Fuel pump, screen and harness changed..and Fuel Filter....Still Same Problem....

Any ideas would be greatly appreciated...I only have 98,000 KMs on the Car...and I can not believe the Motor is shot....

Hope to hear from you soon!!

Wild!!!