High idle sensor problems
Asumming it did not do this before, and suddenly started, have you also noticed a loss of power at very low speeds? This could be caused by a vacuum leak, One of the little rubber hoses that attach around the carburetta or intake manifold may be disconnected from dry rot, cracked, stretched out etc. You likely will need to remove the air filter housing. Look around for a loose skinny hose and where it may have popped off. Somtimes you can trim the tip off and reconnect it, but they are cheap for a short section to replace, from any auto parts store. Take old one with, to check size.
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