I adjusted the carb today and got It to Idle perfect and Idle on It's own, but when u full throttle It It sounds like It misses but It still runs great. I drove It around the block and It didn't stall once sounded great, I even engaged the blades and no power loss or hesitation. Also noticed when It's at full throttle the Idle screw/Idle valve bounces back and forth causing It to rev up and down, If I hold It sill It runs perfect. It's a 12 HP Briggs & Stratton Flat Head.