I had an episode yesterday of my car not getting full power while in drive?

What is your question?

I only had it occur once yesterday while I was driving on the highway. I just began to lose power. I do have a manual/automatic transmission. I was checking to make sure I was in Drive and not in manual, and I was still in drive. I pulled into a parking lot going very slow as there was not much power in the pedal. I turned my car off and then sat for a few minutes and turned it on again. It seemed to run okay, but it felt a little stiff. I only have 26,500 miles on this car and I have kept up with all maintainence appointments. No alerts were on the dash either?