Q: automatic transmission is changing gears at random and on 1999 Kia Sephia

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the engine repair light comes on and the transmission downchanges, the engine light goes of and the transmission selects the correct gear.
i changed transmission but no changes to the performance and the same problem occurs
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