84 lesabre high idle even when warm

the car has a 5.0 307 and i think its the original carb. it has a very high idle even after it warms up. if i hold the spring on the carb in a certain position it slows down a little but still not enough. is the
problem just the spring or is it something else? all replies appreciated
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If the throttle position on the carb is ok, then I'd look for a vacuum leak (carb to manifod gasket, vacuum line, etc.).
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Dirty choke plates. Use spray "carb cleaner"(e.g. Prestone, STP etc.) on the inlet throttle plates until they're clean. Change your air filter regularly too.

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