Could be many things; for example, battery, alternator, starter, fuel pump, crankshaft position sensor, or bad spark plugs. First I will check the voltage of the battery and the alternator to discard both of them. Second, I will check the fuel pressure to discard the fuel pump. Third, I will replace the starter and the crankshaft position sensor.
Prices at Autozone (in case you have to replace any of those parts):
Battery $104.00
Alternator $144.99
Starter $158.99
Fuel Pump $134.00
Crankshaft Position Sensor $79.99
NGK Double Platinum Iridium Spark Plugs $8.49 each (you need 8)
****all plus tax and labor... GOOD LUCK!
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