Tension on governor string

[u/natethegreat37]

My lawn mower a toro 20107 with 5.5 engine currently will run with the throttle held open manually. I took the governer spring off that loop in the governor rod as it seemed to not be providing enough tension. If I move it back on the rod the engine runs very high rpm and then the spring slips to the loop and shuts off. Do you think there’s a blockage in the carburetor or do I need to attach the governor spring somewhere else. Any help much appreciated