Haven't flown my Duster in a while and I'm dusting it off and getting it ready to take to the field tomorrow. The receiver has flaps connected with a y-harness, Ailerons connected with a y-harness, Elevator, Rudder, and throttle. The elevator and throttle servos flutter when turned on and the flaps don't work at all when everything else is pluged in. I've switched recievers with the same results. Also tried new servos with no luck. I've flown this plane before without any problems... so I'm at witts end now... anybody have suggestions as to what's going on. Thanks