Mario Kart Wii problems

[babeldude]

So i just downloaded Dolphin emulator (4.0.2) and when playing super smash bros brawl it works fine but Mario Kart really does not run well. First of all the sounds all lag and are very choppy and the game seems to follow in their steps as it slows down immensely at random times even though the framerate stays over 30. Is there a way to fix this? I am forced to use Dolphin ver. 3.5 which is alot better but hardly perfect. I just want to know if there's a setting that i'm missing or something cause i would love to play on 4.0.2.