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The most likely reason for ignition power issues is either a flat battery or a fault in the charging system. Do you get dashboard lights when you turn the key to the first and second positions? Do the dash lights dim when you turn the key to position three, (Engine start)? Do you get any sounds when you turn the key like a 'click' or the engine turning slowly?
Here is a simple battery test. Turn the ignition to position 2, (ignition On, engine Off), Turn on your lights and switch to Main/High beam. Stand in front of the car an look at the front lights. If the battery is low they won't be very bright.
Do you have a multimeter? Put the probes directly on the battery terminals with red to the positive and black to the negative. The multimeter set to volts should give you a reading of 12.6 volts or higher for a fully charged battery. Anything at or below 9 volts will not be enough to start the vehicle.
** Keep well clear of any moving engine part!**
If you can get the vehicle started, (Jump leads or 'bump start'), use the same method on the battery. This shows if the alternator is supplying charge to the battery. You should get a higher reading, somewhere around 14 volts.
Comment below if you need anymore help.
When it shuts off while driving, a vacuum in the gas tank can built up when the gas cap is restricting ventilation.
The power regulator may be at fault as well. Have you checked the ignition coil for power? Is it going to the spark plugs?
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