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Sounds like a vacuum leak to me. You could also have an idle air control valve problem. The throttle body could have excessive carbon. You could try cleaning the throttle body first.
You will need a scan tool as well to diagnose this, you need codes. You will also need to view live data on the scan tool and look at things like fuel trims and o2 sensor voltage.
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Check for vacuum leaks by spraying throttle body cleaner on all the hoses and intake gaskets while at idle, listen for rpm to change. Also check your idle air control valve. With a scan tool you can open and close the IAC valve and the idle will rise and fall. This is how to diagnose the valve.
Does your code reader read live engine data?
Also a fuel pump and fuel pressure issue will cause a stall, you would need a fuel pressure gauge and watch pressure as the engine stalls. Fuel pressure problem may not set a code.
There was no phone call so you are only at $26. Let me know tomorrow what you find.
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