Having troubles with the Xl3 Rover wheels {FIXED}

[FlamingOnion_1]

I built this Van looking thing and I put the Xl3 rover wheels on it because the other wheels would be too small.It was working just fine when I put them on (I was able to turn easily and go to speeds up to 25 m/s using the diff steering to make me go faster),but now I switched some settings to make my game run better and now the Rover can only go 5 m/s and I cant even turn the vehicle.I didn't mess with it to much except add some struts and maybe a few other things but I don't think it would affect the wheels. I understand that these wheels aren't the best for the game, but I cant use any other wheel because of how big the vehicle is. 

Edited August 2, 2016 by FlamingOnion_1

[FlamingOnion_1]

I Fixed the problem now...For some reason if I add a kerbal to the unmanned vehicle it will not work...