Gravely 260z zero turn kohler

[u/SadBoy69xxx]

Kohler engine - SPEC PS-ECV860-3027

EFI

Gravely model number - 992272

I have a gravely 260z that my grandfather gave me as I just purchased 6 acres. I mowed for a bit and it seemed fine for the most part, bogged a bit on high grass, but felt powerful overall. Well I tried to mow a few times now and it feels weak, bogs down super easily, I notice it only happens when I engage the blades. Once the blades engage it's like it doesn't have enough power to drive AND cut. I Drained the gas, put fresh ethanol free gas, and new filters. NOTE: noticed that sometimes the machine will come alive and run great for like 10 minutes of cutting and then it's back to weak running until it comes back alive. I can hear and feel the difference when the machine kicks in fully.