Automatic Transmission makes a bang noise on 2006 Hyundai Tiburon

Everytime drive slow when it changes from second to therd it makes bang sound and the car shakes but when i drive fast it changes well and sometimes i dont have any problem i check the fluid level it's ok and i scan the car it said speed sensor selenoide and air mass flow sensor like if there wher damege please help.
Oh, the shiftronic doesent work

take to tranny shop and have them diag the problem