shifts funny from a dead stop, rolling stop, and sometimes when driving, and when slowing to a stop

When I am slowing down to stop, say at a red light, before I come to a complete stop it jolts the gears, sounds as if switch from 3rd gear to 1st and skipping the second.

Then other times when I am accelerating it doesnt shift properly or efficiently. The engine gives off a roaring sound, similar to if you had a manual and waited till redline to shift everytime, but the funny thing is that the RPm's are only showing to be around 2000-2500. There is either a problem with the transmission or with the electronics. I am guessing the electronics, because it doesnt do it all the time.