yup unscrew,
take out,
keep the o-ring safe (if damaged or gone old hard brittle then replace it),
flush any carbon out the valve with brake cleaner & brush & swivel the inside valve 90deg with ur finger to loosen any dirt & ensure the valves ball bearing shaft ain't sticky,
refit the o-ring onto the IACV, put a dab of oil around the ring with ur finger,
carefuly reinsert back onto the TB, gently twist & push down, it should slide in effortlessly. if it's squishy, recheck if the o-ring is sitting correctly.
secure & plug it in.
