I Have a Craftsman 917.273022 from 1999. it looks like the GT5000. It has a Kohler CV20s... i had to replace the carburetor because the old one caused the motor to surge and not idle... It idles now but when i mow (i have a big hill) it runs at full speed going down but it slows down going up to the point where i have to turn off the mower.... the throttle and carburetor seems to be intact and it never did this till replacing the carburetor. I need some help troubleshooting this..
any help would be appreciated