95 5-speed Integra LS.

Warm idle seems to be fluctuating. Sometimes, its steady at 900 and will
stay there for the duration of time the engine is running. Sometimes its at
700 and will stay there for the duration. Sometimes its at 900 for 20 mins,
then at 700.

Is this normal? If not, what are the items to check?

Tks,

RF