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Hi, the most common cause of this problem is either a bad fuel pump relay or a bad ignition control module. You need to check to see if the fuel pump runs when cranking the motor when the car will not start. If the pump doesn't run I would replace the fuel pump relay. If the pump does run then you need to test for spark from the ignition coil. If you have no spark I'd suspect either a bad ignition control module or possibly a bad crankshaft position sensor or ignition coil. If you find that there is spark from the coil and the fuel pump runs I would suspect a bad distributor cap and rotor.
Let me know if you have any questions.
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