1996 Mazda 121 Car will not start sometimes.

We don't have that model in U.S. But check your interlock switch top of clutch pedal for loose or bare wires touching something like the pedal or bracket. Also check fuse s under hood for corrosion if there is any clean it off an duse dielectric grease on the prongs. It may also be a bad connection at clutch interlock switch. If wires have rubbed through just a bit then put electrical tape on them and move them out of the way and tie them down with tie downs, plastic ones. Other than that i'd say scan for codes and check fuel pressure with a gauge but we h ave no specs for fuel pressure.