slant six ignition issues..shuts off wont crank

Check you connections around the stater relay and is it a automatic? Try starting in neutral and wiggle the shift leaver back and forth while trying to start. If it starts after the wiggle it may be the neutral safety switch is out of adjustment. As far as the shut down while driving it may be the ignition switch or the ballast resistor or a loose wire. Idel the car and wiggle the wires around the coil/ECU and the bulkhead connectors.