92 Protege recently replaced engine (rebuilt). Ran for a day then died. Replaced fuel pump, fuel filter, computer, new plugs, still wont start. Ran diagnostics and everthing checked out fine. Please help. That engine cost alot of money for it not to be running yet. Any and all suggestions will be greatly appreciated.

Have you check the timing belt to see if it has jumped? Compression test. Double check for fuel pressure & injector pulses. Check that the white with red stripe wire from the four wire connector on the distributor has power. Double check for ign spark from the coil
lead & one of plug leads.