Need help with shifting problem

Hi, i had p305 &p302...my mechanic replaced the ignition coil 2 & 5...the check engine light disappeared..none after that but im noticing the shifting isnt that smooth all of a sudden...should the speed sensors be replaced or if i can get the computer updated

Today, i drove my car in the morning after my the check engine only comes on after my car hesitates in 2nd gear the rpm is at 2 going 40mph...it stays there too long....this problem does happen when my mechanic is looking at my car...