My automatic 2005 CC 4x4 Nismo, for a while felt like it would search for a gear and then would buck pretty hard when it shifted. Last week when driving I went to accelerate while at cruising speed and it felt like I went in to neutral it would rev but had nothing and coasted to a stop. It wouldn't move in any gear but would rev like in neutral. If its off for a while it will drive but then after about 100yds or so it does the same thing. Am I just going to have to accept that I'm going to have to get a new transmission or is there something less severe going on. I am not much of a mechanic either so no matter what it is I will be taking it in somewhere. Thanks for any and all help.