hanger 9 corsair, zenoah, 20cc, dx7 this thing has been taxied already, now all of a sudden when we start the engine the throttle goes wide open. when we turn off the ignition switch the throttle goes back to low. any insight will be appreciated.

hopefully u r not using a metal rod from start to fnish on the throttle
hopefully u r not using one battery to do it all

how would a one piece metal rod make a differance?

the metal rod could then transfer the rf interference back to the servo. so u use metal rod ends with the rest of the space being hollow if using a tube. u only need to do this on gas engines. i hope that makes since.