Start Hyundai Elantra 98 problem

Hello, my problem is the following two months ago the car stopped in a semaphor stopped derepente, trying to make contact towards the starting noise but did not start, after 10 minutes detainee it started without problems, this occurred about three times intermittently for a week and a half, I still carry it scanner, and threw the motor control failure, the person told me that I could not determine what the problem could be BOBINA SENSOR CIGUEÑAL O RPM, O BOMBA DE BENCINA , AUNQUE ME PREGUNTO SI ME DABA TIRONES EL AUTO Y LE CONTESTE QUE NO, POR LO TANTO LO DESCARTO, REVISO BOBINA Y TENIA ESCAPE, PUES LA CAMBIE, LA FALLA DESAPARECIO POR ALGUNOS DIAS Y VOLVIO A FALLAR, CAMBIE BUJIAS, Y ESTE PROBLEMA DESAPARECIO POR DOS MESES, HACE UNA SEMANA EN DONDE DENTRO DE UN PERIODO DE 5 DIAS SE ME A DETENIDO EN UN Semaforo and the other at the head of a house when I went to leave a person, in both cases I had to wait 15 minutes to start the vehicle again, which then behaves without problems, I have read on the Internet that can be the flower (air sensor) T sensor, RPM sensor, IAC sensor or Ralenti actuator, as you can see the problem after two months, you could tell me, you could tell me what you can tell me, you could tell me what you can tell. Because the truth I cannot change all these components, but I want to know what is the spare that I really have to change, when the engine stops all the red lights, oil, contact, that is the same that is the same when one stops the car with the key when you get contact, no more light is turned on, hopefully you could help me to buy the replacement that really fails. Atte Pato

You changed the pump, I imagine that filters,
spark plug