Walker surging after it warms up

[tbone-works]

I have a 2003 walker 26 hp kohler efi and it runs fine when I first start it up but you run it a while and it starts surging. Service engine soon light comes on and it will hardly run the deck after a hour or two of mowing. Anybody have any ideas why?

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[mechanic mark]

http://www.kohlerengines.com/onlinecatalog/pdf/24_690_01_EN.pdf service manual horizontal shaft

http://www.kohlerengines.com/onlinecatalog/pdf/24_690_02_EN.pdf service manual vertical shaft


Without model number as well as all numbers from engine data plate I'm trying to help you out, see troubleshooting sections.