1992 Camry, A/T. After stop, car picks up speed at 2000 rpm. Engine idles rough on 1992 Toyota Camry

213,000 miles, A/T. After having the transmission fluid drained and refilled, car hesitates after coming to a complete stop. If I step the accelerator, car picks up speed at 2000 rpm. I now put the car in low to get it going, and then shift to drive. No codes registered when mechanic hooked up transmission to computer. Most of the techs I talked to said I need a new transmission.

The car also idles rough when coming to a stop. Does ethanol in gas have anything to do with the rough idle? The rough idling started after I had a tune up done.

poss vac leak? have a smoke test done to determine source of leak