GMC Troubleshooting Questions? Ask a Mechanic for Answers
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The first thing that needs done is to have the fault codes read out with a scan tool that can communicate with the engine computer.The code(s) set will help diagnosed and locate the fault here.I have seen issues with the crank sensor that can cause this type of fault as well as the throttle body.In some cases just cleaning the carbon from the throttle body bore in front of the throttle plate can correct a stall out like this here.This will block air flow from entering when the throttle is released and can cause a quick stall out.
If you can get the codes read out and post the code info here this will help.Usually places like Auto Zone will read out fault codes free of charge.