i have a 08 rzr and one day i was riding on tha hwy and it just lost all power. it wont hardly get to 25 mph. it still idles fine and starts fine. its always used about a half a quart of oil a day if u ride it hard. it is also blowing oil out the valve on the valve cover. when u start it now it idles fine and revs up fine but when u put it in gear and try to take off it misses and has a huge loss in power. any thoughts on what my prob is? any help would be great.