91 buick regal 3.8 car stalled

sec life ?????? SECURITY LIGHT ? anti-theft system problem . The Pass-Key II® Theft Deterrent system prevents vehicle theft by disabling the starter motor and fuel system. If the Body Control Module (BCM) dose not identify the use of the correct ignition key to start the vehicle, the (BCM) will communicate a message to the Powertrain Control Module (PCM) which will disable the crank relay and fuel delivery to the engine.
When the (BCM) identifies the use of the correct ignition key (resistor pellet) to start the vehicle, the (BCM) will send a fuel enable and starter enable message to the (PCM) which will allow the vehicle to start.

How to bypass GM VATS system GM no crank no star

Is your SECURITY light flashing? If so, you have a V.A.T.S. problem. VATS stands for Vehicle Anti Theft System. Try getting a new ignition key made because the resistance value has probably changed in the one you have. If that doesn't do it you'll need to get a VATS bypass.

If it is a 3.8 engine change the crank sensor,they go bad on the 3.8 engines.

computer needs to be program ...

I had the same problem with my 98 regal. I replaced a wiring harness on the steering column that has heavy gadge wires coming from the fire wall and going to a small black box directly below the ignition switch.Since I replaced it I have not had any problems

most likley a fuel pump issue. The only way to know for sure is hook up a pressure gauge and when you have symptoms check the pressure. If you spray some brake cleaner or quick start when it doesnt start and it does start then this is an indication of a failed fuel pump or fuel pump relay. If it still does not start when you spray then you have an ignition issue like a crank sensor or ignition module.

replace the ignition module,under the coil pack.

CRANK SENSOR CRANK SENSOR CRANK SENSOR

have you thought about the mass air flow sensor this will cause that also

Sounds like the EGR valve is bad.