Where is the computer module on 1999 town car?

It is located just above and behind the e-brake pedal. You will need to remove the lower dash/foot cover to see it. It is silver in color and about 6"x9". It is removed by loosening a bolt that hold the wiring harness to it, in the engine compartment using a 10mm wrench. It will be located just below the brake boost on the firewall.