1986 Volvo. Yesterday after driving about 35/40 miles on the turnpike at about 65 mph it started slowing down. Motor was reving but the power was slowing, slowing. Got to a parking lot area and checked the tranny fluid, it was ok and full. Waited about 20 minutes and got in and drove the 9 of the 10 remaining miles home at normal speed. 1 mile from home, same thing. Turned off the motor, waited about 10 minutes and upon starting it up it ran fine and I got home. Hubby is going to change filter and fluid this weekend, but if it's not that we don't know, guess it will have to go to a shop. Any ideas would be appreciated.