H governor surging

We have an H that the governor is surging up and down. If you idle it down it will idle smooth, if you open it up 3/4 throttle it will run out good. Under a load it smooths as well, but as you idle down half way without a load it starts surging. Any ideas????
 
check governor spring or any binding or linkage issues. Also check for play in the linkage when the tractor is shut off this might expose some wear that could be an issue.
 

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