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If it comes back on and the battery acts normal-like it has a full charge and easily cranks the engine over to start-not the battery, starter or alternator-I would suspect a failing ignition switch or a poor connection between the battery and the switch. But in most cases it is a bad switch. This could be tested with a voltmeter or test light. Just check for power into the switch when it won't respond to the key turning.
Good chance it is not getting fuel, or enough fuel. When the rig is cold, the choke is closed. As it warms up, the choke opens. If the metering jets inside the carb are dirty, they may not be letting enough fuel into the barrels. You could also have a vac leak that is masked by the choke until the engine warms up.
Fuel pump in gas tank, more then likely not fuel pump, do fuel pressure test should have 13 -15 psi fuel pressure, Pull codes and data get reading out of M.A.P sensor this one at like a choke, also from C.T.S sensor also acts like a choke, check for a misfire 1st pull one spark plug wire at a time.the one that not fireing chould be a defective wire or bad cylinder compression ( do cylinder compression test ). Good luck,hope this was very helpful.
Your choke is working to good, to much fuel not enough air, if smoking after engine is at normal engine temp.you need to have coolant temp. sensor or your map sensor check, both act like a choke, you'll need to do a computer scan, also have engine check for a miss fire, well also cause a rich problem.
With the spark dying it sounds like electric problems. Your coil can be failing when it builds up heat sitting. The fan air and air from driving can keep the coil cool but then it acts like a heat sink when the engine sits.
The battery can also play out in heat, have it tested. Finally the ground wires could be dirty. The motor has more compression when hot. This time of year cold oil is not a factor on cold starts, so you do not have problems on the initial start. The starter ground seems okay, but the chassis ground for the ignition could be corroded.