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They can get a bit stuck, but if after some good wiggling and lifting it doesn't come off, I would very much double check that you've removed all the bolts.
Under the throttle body is an aluminum elbow going to the plastic manifold. That elbow has one 8mm bolt head on each side just above the front of the transmission. Make sure those are removed. You may also have to loosen two other bolts on each side of the lower elbow bracket as it pinches that elbow into place. Other than that, it should be loose.