the lock might be jammed by having the door rod bent from someone opening it with a slim jim, causing it to be slow
i can tell you did some searching as you knwo about the ecu part
someone mentioned a ong time ago of how to program another key with the same fcc code to your car
problem is if it doesn;t work you need 2 new keys with an ecu chip to insert into it , it is cheaper and better to get a good remote starter alarm installed