Zero Turn engine Rough Idle

It is surging due to a lean air fuel mixture, meaning you either have too much air entering, or Not enough fuel being supplied.
Has the mower ran good previously? Has it been sitting?
 
Try running some Sea Foam through the carburetor.
Mix a double dose in the gas tank, run for several minutes to draw the mix into the carb, then shut off and let it sit.
(Had a snowblower that had to sit for several days to dissolve the clogged jet).
 
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