1995 Nissan Altima

I have an 95 nissan altima and it will run for 15 minutes then die somethimes even while going 60 mph and will not start for 15-30 minutes I have changed the computer, distributer, maf sensor almost everything that I could think of can someone help I am running out of money lol and need to find out what is wrong without taking it to a shop. Thank you anyone that can help me!
Jon whitlock
June 15, 2007.

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