Automatic transmissions can become erratic owing to bad fluid, low fluid, blockage of the sump screen filter, or combinations thereof. If it has been a while since the fluid was changed, it would be advisable. I'm not sure if that particular model is pressure or vacuum modulated or is ECAT-modulators can also affect shifting irregularity.
Make sure the person you elect to service the vehicle is properly credentialed, better yet from a recommended shop, reducing the likelihood that you'll be taken advantage of. Good luck
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