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Dr. Doctor
 
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Default Lawn Mower Idle Oscillates

hunt or oscillates can be the spring but in all my years of working and
teaching on small engines it is not a common failure. there is a list of
possible here is but a few, air filter plugged, worn throttle shaft carb,
intake manifold leaking, governor problems (worn or misadjust) linkage worn
bent or missing, fuel problems.

as I said the list is long but when one runs into a problem with a spring it
is more common it will either be stretched and the rpms are too low or
modified some how and has too much tension making rpms too high.

good luck