Try adding some specifics please.
2003 dodge neon that will start but will not stay running and dies after it starts?
antiteft will need to be disabled.
Fuel pump is gping out it may have enough fuel to start then it works like a vacuum but the pressure is not enough to keep it going. Same thing happend to my Buick Lasabre.
Either it starts and dies, or it will not crank.Either it starts and dies, or it will not crank.
what is the problem if a Chevy diesil engine start and run 30 minuits died and start right up again
I would guess, it is starving for fuel. Start by replacing the fuel filter. If that does not help, suspect the fuel pump.
If the theft system light is flashing...try to start car,when it starts and then dies,leave the key on for about 10 mins. until it stops flashing.Turn key off,Now start the car as usual.
2007 honda civic starts up then dies
If engine starts, Fevs, then dies. Check for diesel fuel in gas tank.
check the carb...then adjust the valves...
If you have power enough in your battery to start the car, then this is not the likely cause. Maybe the carburetor is in need of a proper rinse.
Lack of fuel .