One of my quads is acting weird on me. 2007 sportsman, EFI. Go down the trail a ways about 10 miles. Fan kicks on. OK? DOesnt usually happen. THan another 5 miles it starts to lose power. Slowing down by it self. even when throttle is half pinched and on big POP!! happens back fired. than quits totally. Doesnt wanna start. Lights come on everything tho. CHeck engine light shows itself for no more than a second than u dont see it again. THe rpms i seen go back words. lol counting from 4000 to 0. whcih is ocward. Im thinking main computer wire lose or thermistate? i wanna make sure. any advice. NEver seen a problem like this before. Even has my 5 uncles stumped