need help!
 

i have a 2000 mazda protege 1.6 (dx i think) and when i start my car it kinda starts but dies within seconds. i open the hood and plug and unplug the camshaft sensor and after a couple of tries it starts and runs without problems. i changed the spark plugs and wires and replaced the camshaft sensor it has a new one but the problem still persists. i took it to the mechanic and ran a engine diagnostics and no error code came up.The mechanic suggested to change the crankshaft sensor could this help?does anyone know what could be wrong?! any suggestions would be helpful thanks.