are you sure you haven't shaken out the idle stop screw?
check that nifty photo 'robotech' put on page 1.
i'm not familiar with GS but throttle limit is pretty universal.
in nitro, once you get it running you have to keep an eye on things and make sure parts aren't going away.
those gummy bands work nicely for throttle return safety just place them on a 'cooler' part so they don't 'vaporize'.