Hey Gang. I'm a total newbie from Canada. I found this site looking for help in figuring out what is wrong with my Rhino. I see there's a lot of info here, so I'm going to take some time to look around before I start hounding you with questions.
First thing to check is your fuel return and vent lines. They are notorious for getting kinks. Sounds like fuel delivery issue to me.
Could be fuel pump as well. Or clogged fuel filter. Popping/sputtering on decel is usually due to lean condition.
Rutting Rhino (sponsor on here) has some clear fuel line kits for cheap, which can help diagnose fuel issues. But either way, sounds like fuel delivery is the problem. Could also be improperly adjusted carb bowl float.
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