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A bad main relay could cause the computer to not test the immobilizer when the key is turned to ON.

Do you hear the fuel pump run for 2 seconds when you turn the ignition to ON and the immobilizer light is off?
Agree, symptoms, point towards "main relay". Common on 1st generation. Lot's of posts/pictures on this topic.
Main relay, under dash, above brake pedal.
 
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