Hello all, Have a 72" Kohler efi with 650 hours on it. It has been in and out of the shop for the past 2 months and they still haven't fixed the problem. While mowing it will lose most of its power and slug along, but the blades will still cut. The last time it just shut off completely and had to push it on the trailer. They tried changing 02 censor, there was a crack in muffler (that was replaced). NOT TO MENTION they gave me a loaner since it's been in the shop so much AND THE LOANER HAS THE SAME ISSUE. Anyone else have this issue with an EFI? Any solutions? Thanks in advance.