Repairs honda hrb 215 throttle problems

Hi all rayyar here, I am a new member and need some help with a Honda harmony hrb 215 I just picked up. the govener holds the throttle wide open all the time and no amount of adjusting the linkeges solves this problem. the only way the engine will run is if I hold the throttle closed manually and then it will idle but It imidiatly dies if I give it any more fuel, but it will rev up if I hold the chock closed and open the throttle. thanks for any help I can get.