troy bilt flex

     I have owned my flex a few years now and it has done what I needed it for. After changing the drive belt last week and using the mower with no issues, upon starting it today it took off without me engaging the drive throttle. I shut it down thinking it was a one time fluke, but even after physically pulling the drive belt off of the tensioner, when I start it up it still wants to drive off. Anyone have any advice?