OT: Kohler Command Pro 23 issue on Grasshopper

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I have a 223 with a Kolher pro command engine. At times, when it is given full throttle it tries to die off. I can let off the throttle handles and it will perk back up. Seems to be worse when engine is warm. It always starts right back up no problems may go another 30 minutes then does it again or it may do it several times in a row. Really bad if trying to mow grade because of need to push more throttle. We have changed fuel filter, cleaned trash from bowl, tested coils, stater, changed air filter, and added sea foam to the fuel. I have been able to mow and have added new fuel as it gets low. Very frustrating! Help please!