I am in the process of the traditional break in procedure for my new Tsunami and all the sudden the automatic brake system and 4wd doesnt work.. When i picked it up and gave it gas, only the front 2 wheels spun. Also when i gas it, then let go of the throttle, its almost as if the throttle is stuck and it keeps goin althought i am not holding the throttle?!?!?! Any suggestions?

The whole throttle still going makes me think that the clutch spring could have come loose or broke, refer to the sticky Clutch spring and bell thread for details on how to verify that.

On only the front wheels spinning, makes me think that something is up with your rear driveshaft or differential ... hopefully someone will respond with regards to that.

2 wheel drive huh sounds like a grub (set) screw may have came out of the drive cup that holds the dogbone that runs from the trannny to the rear diff