idles to high @ 1500 rpm
does throttle wire stick? is the pedal returning fully? are vaccuum lines rubber? if so replace them if 5 yrs old +. leaky injector(s)??? these are just some questions to start with. check engine light lit?
likely a choke issue, take off the air cleaner and check the choke when the engine is both cold, then hot. it should be open a small amount when cold, and not at all when hot
could also be an air leak, either through the gasket, or vacuum lines
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