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Riddle me this... hot start 'N dies, miss / cut out only in summer

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Starts right up when cold and runs excellent all winter long and short trips around town. smooth and powerful from idle to redline.

The problem is during summer after a 60+ mile highway drive, It will run great the initial drive until shutoff. When trying to restart it cranks a bit longer, fires, revs up (as usual) then dies. Have to crank awhile and manually give it throttle so it stays running. Will run slightly rough from idle to redline, cuts out if you mash the gas or even smooth gentle throttle inputs. Definitely a miss like electrical or no fuel? Once you let it cool down for at least an hour, it fires up, revs, idles fine.

This was a once a year random problem only with the hard starts when warm. This year is the first time it has missed or cut out throughout the RPM range after a heat soaked hot start

NO Service Engine Soon light.

What do you think the problem is?

Anyone experience something similar?

97 K1500 Vortec 5.7 Black Bear Tune. 210k miles
original poppet spider fuel injection
Fuel pump (2nd time) replaced 30k miles ago with Delphi pump along with new fuel filter
New plugs, cap, rotor, wires 20k miles ago
New Bosh O2 sensors (all 4) 20k miles ago
New high flow catalytic converters 20k miles ago
Engine grounds are clean

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