i went riding the other day and noticed i had no power...so i thought i maybe my top end is sarting to go..when i got back home i went to take the head of to check it...turns out the spark plug was really loose which is prob why i had no power..so i tighten it back up and fire her up and now wont idle i have the air screw turned all the way in and yet the quad is still idleing really high..i tried messing around with the idle screw on the top of the carb and the air screw on the side of it no change...anyone know what this could be ?