i have replaced my fuel pump, battery, spark plugs, and starter on my 2009 mits

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i have replaced my fuel pump, battery, spark plugs, and starter on my 2009 mits galant ES 2.4 and it will now turn over but will not remain on. Please help running out of money and ideas. Drove home one day for lunch no knocks or noises but was possibly a delay when starting the car but thought it was due to the battery life that was only at about half of its percentage, it just wouldn't start back up. We initially thought it was the O2 sensor and battery replaced them first and have been replacing part since