94 Ranger cuts off

[elnakman]

I have a 94 Ranger 4x4 v6 4.0 that cuts off. It turns on and after a couple seconds it turns off. The check engine light stays on. I tried pulling codes with a jumper cable but gotten none. I think i'm doing it wrong. I go to the EEC test harness and jump, I turn the switch with the motor off but the cel stays on. It does not blink, just stays on. The truck turns on, when its cutting off I just give it some gas to stay on. Any help to what I can do to pull the code(s). Has anyone have had this problem???

 

[crbnunit]

Check the idle air bypass valve on the side of the throttle body. If you can keep it running by giving it gas, that would be my first guess.