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usually it is a vacuum leak which is letting more air into the engine. With engine running, use a spray water bottle and mist around all vacuum lines, the power brake booster and engine seams. Then try any vacuum line to the transmission. Could also be a burst vacuum shift diaphram if so equipped.
this is usually a sign of a vacuum leak, if they took the intake off they probably had to take off more than 1 vacuum hose, make sure all the hoses on the intake are in good shape and connected tightly, a good way to find a vacuum leak is to take a can of brake cleaner and just spray the hoses (1 by 1 preferably) as you spray the hoses see if you notice the engine either idle higher or lower, if this happens while your spraying a hose this will be the hose with the leak
Most likely the intake gaskets are bad. they will sag in the middle over time and allow a vacuum leak between the head and intake. recommend replacing the gaskets with the steel instead of plastic ones.
is the check engine light on ? if it idling high chances are you have a vacuum leak take a can of carb cleaner and spray the egr valve and if the engine rpm changes replace egr valve the throttle body may also be plugged pull the vacuum line off the map sensor start vehicle and see if you have vacuum if not remove throttl body and clean vacuum passage hope this helps