Out of curiosity, how many miles on the transmission? Sounds like it's slipping, so I'll say a rebuild is in your future. Even with the best of care, it seems these transmissions like to go anywhere between the 200-300K range for most of us.

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1985 300D
1987 300SDL
1970 Jaguar E-Type OTS
2002 Dodge Intrepid (Traded In)
2011 Ford Crown Victoria