I hope to help people scared their might be a serious expensive problem on their hands when their Jimmy starts then stalls right away.
I had this problem and was able to do simple elimination I hear fuel pump come on truck does indeed start and then just dies not mechanical cause it runs atleast for a second
This means this is probably a electrical problem but with what I watched my lights and the only one on through the start stall process was my Security light
Here is what to do start out with your key in the on position reach below underneath steering wheel and press your Red alarm switch hold this untill your alarm LED blinks off vehicle may beep once light is out turn key off remove it from ignition exit vehicle with key in hand close door.
Next hold the small button on your alarm keychain until LED blinks inside vehicle a beep sound may occur as well once this is done press your normal large alarm button vehicle will beep its normal unlock sound reenter your vehicle and start as normal.
If this works please let me no with alittle feedback firstname.lastname@example.org