Theft light is on along with the service light and motor stalls

Hello, I'm Danny.

Having the anti-theft and check engine light on means there are trouble codes stored in your cars computer.If you don't have access to a scanner/code reader most auto parts stores will check for free (AutoZone). Here is a tutorial showing what is involved:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also here is a tutorial showing how to reset your anti-theft system:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Scroll to the bottom after reading to find the Pontiac instructions.Once you have the code(s) read get back to us with the information to help properly diagnose the problem.Hope this helps and thanks for using 2CarPros.

Danny-