Security has me locked out of 98 firebird

You have the VATS security system. There's two tiny wires inside of the ignition lock cylinder that must contact the chip on the ignition key so the computer knows you're using the correct key to start the engine. I suspect that from sitting the wires in the lock cylinder are corroded and not making contact with the chip on the ignition key. Try spraying some electric contact cleaner in the lock cylinder. Then slide the ignition key in and out of the lock several times. Hopefully that'll get you going. But if not you'll need to unplug the connector for the lock cylinder at the lower end of the steering column under the dash. You'll see a black wire and a white wire inside of an orange covering. Measure the resistance value of the chip on the ignition key. Insert the ignition key into the lock and measure the resistance value across the two wires you unplugged at the bottom of the steering column. The resistance value should be exactly the same as the resistance value of the chip on the key. If it's not, which it probably won't be, you need to replace the ignition lock cylinder. Here's where it gets a little tricky. The new lock will come with a template for cutting new VATS keys. The template will not start the engine. Since you have the resistance value of the original ignition key you can use the chart below to get the correct VATS keys, use the template to have the new VATS key blanks cut, and you'll be able to start the engine. Hope that helps! Jim