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Check the vacuum line coming out of the plastic box attached to the side of the injection pump. That line goes to a metal tube under the intake manifold then down to the modulator on the side of the transmission with a little short piece of rubber in between periods probably rotted out somewhere.
Your post is lacking quite a bit of information. If slow to change up means it is waiting to make the shift till redline you probably have a rotted out vacuum line to the modulator.