95 Intrepid Wont Start

My sons 95 dodge intrepid 3.5 with around 175,000m died the other day. There is fuel pressure and we checked the coil with a volt meter it seems to be in range. We pulled the #1 plug and it sparks once and only once when we turn it over. That lead me to believe that it was the crps. So we replaced that and still have the same problem. I tried to check the codes but they were cleared since he drained the battery trying to start it after it died. Now im thinking maybe cam sensor or possible the timing belt jumped. I can hear the valves open and close so I know it didn’t break. I have been told that it could be the map sensor. I really don’t want to put more money into it and then end up taking to a shop because none of it worked.