Your problem is the chip in the key or the ignition. Try your other key before doing anything else.
If you turn the ignition key to the run position , the pump runs for about 3 seconds and then shuts off if you don't start the vehicle
sounds like ignition module. Check for spark while cranking engine when it decidedly shuts down on you.
it has to be a relay or ignition problem
If your Dakota shuts down after 5 or 10 seconds then change the map sensor. If it shuts down after 3 or 4 minutes of driving and won't restart look for a bad harmonic balancer. Experienced both!
After the ignition key is turn off the car runs for about 3-5 seconds and shuts down. Recently, I had to disconnected the coil wire to stop the engine. The next morning it went back to the original problem.
Your 1991 4.3 S10 starts for about 3 seconds then shuts down because it is faulty. Take it to mechanic to have it checked.
the ignition switch could be bad
The alternator is most likely the problem
What Do You Think It Does? It Shuts Off The Ignition Of Your Engine, So Basically It Cuts The Engine Off...
is the transmiton
Ignition module
if no warning and it just shuts down but dash lights and radio light up check ignition switch