gmcyukondriver
Built, not bought.
Honestly, if it's not doing it all the time, I'm still thinking it's the throttle body gasket. Mine was doing the exact same thing, lower RPM then stall. Does it idle smooth, or does it shake a little?
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Takes some maturity, I know, but I think you can handle it.
Thanks for the suggestion And the idle is very shaky when the problem is happening while in drive, so would the TB gasket ONLY have an issue then and not while in neutral/park?
Spray some carb cleaner around it, you should hear the idle change.