Check the float levels and look for a vacuum leak(spray some carb cleaner around the carb boots and fittings and see if the rpm's go up. If they do then the leaks nearby). Another place to look at is the vacuum ports used for carb sync. as they will crack and leak . Carb boots will crack and leak. Look at the choke mechanism as this sometimes has one or more carbs at partial choke.
Have you sync. the carbs lately and had the valve adjustment checked?
Just a few places to check.
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