Got a 2005 GMC Envoy Denali 5.3L stalls @ idle in park after 10+minutes. Usually won't restart for 10 or 20 hours. After stall out has No spark & no injector pulse. Already jumped the gun & replaced PCM. Same issue with old & new PCM. Doesn't seem to be the ignition switch. But, since I am here , Obviously I'm only working on assumptions & brain farts. This morning it started fine after a 15+hr walk away and Had no P codes. Had ignition on , engine off for 20 minutes doing BCM scan / diagnostics. Was careful to not run engine till it stalled hoping to catch a snapshot. Just having ign on while scanning created no start condition. The 4 codes will set by just attempting to start after stalling. If it happens to start I don't get the codes till it stalls . Done wasted $500 ++ bucks on a wild goose chase. I know this is going to be one of those simple fix deals "IF" I ever get to the "fix stage". lmao , if it was funny. Seems to be a common issue on these series of GM units but so far all I can find is people like me looking for the Fix. Any advice is appreciated .
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