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Q:

While driving, the rpms drop from 2200 to 2000, then goes back up and then drops on 2001 Volvo S80

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
This happens at various speeds, flat road and on incline, but usually around 45-50mph. Dealer couldn't reproduce results.
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