What would cause my car to die suddenly and have been unable to get started agai

What is your question?

It fires. Has good compression, have changed computer brain, distributor, coil, plugs, wires, caps, valve job, checked fuses, put new timing chain on and set timing. Still will not start. Turns over fine. Car cut off at about 5 mph. in my yard and has not started up since.

What makes this problem better or worse?

Nothing. Just stopped suddenly going about 5 mph in yard.

How long has your 1993 Geo Metro had this problem?

5 mos.