'05 3.5 Z71 LS Stalling Issue

My truck has had a random stalling issue, been happening for few years. I got truck new, seems to happen if not warmed up enough. Replaced catalytic, injectors, cam & crank sensors over the years. Replaced frame @ all suspension components plus lots engine parts @100K. Now has 110K. Runs OK at startup but randomly within 5 minutes it sputters and throttle pedal does nada then dies. Happened 3 times yesterday within a 1/2 mile. Sat for a few minutes then OK. No codes ever, wish there were. Occurred 5 times in the the last 2 weeks then goes away. Same symptoms every time, happened before frame swapped. Any ideas?