1997 Chevy Lumina car will not start

It all started two months ago when my Chevy Lumina would not start. This happen on a Saturday evening. The car was towed to my house. I tried to start the car again the next day around 10 a.M and nothing happen. Around 5. P.M that day it started. I drove the car and thought that was the end of the problem. I went inside a store and when I came back out the car would not start. I waited ten minutes and it started and I was off. This has happened 3 other times. It would start within ten minutes. A few days ago it happen again but this time it took 11 hours to start again. I thought maybe it was a dirty fuel filter so I replace it When it was replace it did not start. I had to wait an a hour until it would start. It happen again today around 3:30 I had to leave my car I came back at 2 in the morning and it crank up. The car does not stall when I am driving it sometimes acts as if there is no gas in it when this problem happen. I can hear the fuel in the fuel pump so I don''t think that's the problem. It usually does start but it takes up to 10 hours. This problem happens without any warning. The only solution I have is to leave my car on but I cannot leave my car on for 7 or 8 hours while I am at work. Any advice would be helful