I've had the same problem, twice. My shop test drove it and it threw a EFI code, so they replaced the speed sensor. Yesterday, on a 53 mile ride I had no issues at all. One thing that I would ask is, were you, by chance, in 4X4 high and running fast, like 25-35 mph? I don't know if there is actually a "limp mode" built into these machines, somehow, so this is only a theory. The second time this happened to me I may have been in 4X4 running fast. I limped off the trail and idled. A Jeeper cam along and offered to tow me back into Yuma, but he wanted me to try sometime first. He had me shut the engine off, wait a minute, or so, and then turn on the fuel pump until it stopped. Turn it off and cycle the fuel pump again. He had me do this three times. Then, he had me re-start my engine and, for whatever reason, all of my power was back. I drove fairly slow back, so no power shut down. Honestly, I think my 4X4 high switch was on when this power loss happened to me. Please reply about 4X4, because I really need the satisifaction of knowing. This power loss bothers me because I have no solid answer(s) to it.