I actually launched in 4wd and switched to 2wd at the 60 foot mark. Without the TM there is no way this thing will hook up with stock 20 inch tires. In 4x4 it launches as you will see in the vid when we get it posted.
As far as your motor shut off, I am not a mechanic but I would say that is your TM kicking in.

 

Or its shifting to 2nd?

 

Here is the vid of me at the track running a 14.7

http://www.youtube.com/watch?v=G1rNERNBX14

 

Awsome bro!