Need help,the truck was running. I went in the house came back out and it was off. I thought it was low on fuel. So I added some. Still no luck. I sprayed some starting fluid in the intake and no sputter. I replaced the ecm realy and still nothing. Have also replaced the cam sensor. I have voltage at the coil at the white and blue wire. When you turn on the key there in no check engine light. The fan comes on and I can get it to crank. It cranks strong. I have tried to jump it since I have been trying to start it since Saturday. Still no luck. Some time the secuirty light stays on while cranking some times it dont. I need help.