Cooling fan hookup?

Is the antenna wire touching, or very close to any metal parts? If so you should try relocating it. Sometimes this can cause the twitching you described (I experienced this with my rustler). Usually, if you can just run it straight up through the body and not snake it around other components, it won't recieve any interference. Oh, is that a DIGITAL SERVO? I have a Futaba S9451 and it does twitch every so often, but, not enough to affect my control.