Chevy cavalier 2001, engine cuts out, will restart and goes a week or so before repeating. Fuel pump relay/regulator or computer? Any way of testing.

Best thing to do is take it to shop and have them diagnose it for you that way theres no risk of mis diagnoses and you dont spend money you dont have to on the wrong part i do it all the time when you find out what you need check out www.autopartsdirecttoyou.com they got mostly every thing and if its not listed call them up they can probably get it.