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If you have a properly operating system your vats system will:
You may have fuel initially but it will go away as soon as the pcm finds there is not a correct key.
Here is what gm states the system will do. This is their words, not mine.
Ignition Key With Wrong Resistor Pellet Code is Used To Start Engine
The theft deterrent module performs one of the two following actions when you attempt to start the vehicle with a wrong ignition key:
Thanks to another expert who found me this! This will help you with your problem. Here is the link!