Pontiac Problems? Ask a Mechanic for Answers ASAP
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It is very likely that you are going to require the theft system programmed with an online subscription.
When you replace the passlock module most of the time it will not learn the key manually. the theft system will not cause a vehicle to stall.
So when it wont start does the starter crank the engine?
In the underhood fuse box can you check fuse 20 for power when it wont start?
You will maybe have to crank engine to get power.
I would start with checking PCM power and grounds. I have attached the connector views. 21 pages. NU3 is California emissions.
Check the ground in this image #2. Make sure it is clean and tight.
Have you had a scan tool on the vehicle when it stalls. Check the ecm and bcm to see if either one show fuel disabled. This would indicate a theft system
Maybe try running the vehicle with the MAF unplugged. Possible bad MAF.
Another thing to check is when the vehicle stalls what is the voltage at the injector power feed. I had one that the voltage would drop to about 7 volts.