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Q: rpms up speed goes down on acceleration on 1999 Ford F-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
4r70w transmission, fluid good, filter changed. Rpm's go up when engaging passing gear, and speed falls off. I have to let off pedal until rpms fall to 1500, then start again slowly. I've had this problem for 6 months. truck drives fine unless trying to pass. No codes on scan.
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