is the gas gauge reading correctly?
I would wait until the stalling is happening and have the fuel pressure and flow checked.
fuel pressure for the 4.2L should be 50 - 57 psi
fuel pressure for the 5.3L should be 55 - 62 psi
driving the envoy with a scanner hooked up and graphing the PIDs would probably give you the best picture of what's happening when it acts up
1993 GMC Sonoma stalls out hot and hard to restart
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