bogging and occasional backfire 700 RMK

Hello , I am having some issues with my 06 700 RMK 159 , a couple of days ago it started to bog out after the clutch was engaged on a full throttle start it would feel like only 70 % power then after a certain RPM it would clear itself out and rev fine also it would backfire occasionally . I have checked the TPS wiring from the TPS too the computer and seem to have good consistent resistants through all three wires and both connectors i have also checked for airt leaks at the intake boots ????????