ka24de s14 stalling problems

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i rebuilt my s14 ka24de and its running excellent i was having a battery problem so i bought a new battery and alternator the car ran great for one day then today it stalled out on an incline and it refused to start the battery was fine and the car was not turning over only a little RA RA but no start and it sounded like it had no power after about an hour and trying to kick start it, it started up weak but was fine after i cut it off when i got home and it was fine as i started it over and over i noticed when i got it started the radiator hose wasnt tightened enough so i did tighten it and i changed the coolant sensor it seems to be fine anyone come over this situation?

ps i changed the alternator as it was bad after testing and the battery as well

and i got the sensor idea from the forum after seaching so if any one can help i will be grateful