try this, take the air filter off. then turn all of the electronics on, and look into the carburettor hole ( directly underneath where the air filter was ) pull on the throttle (ie pull the trigger on the controller) and look at what happens. let go of the trigger completely. the hole in the carburettor should close up to about 1 to 2 mm from completely shut. If it does not, try putting the brakes on ( push the trigger towards the front ) if the servo turns but the carburettor doesnt close up, look in the manual for the screw called the idle speed screw, or idle screw, turn that screw anti clockwise slowly while holding the brakes on and the carburettor should start closing up. if it does ( and it most certaintly should ) turn the throttle trim on the radio until the carburettor will close to that 2mm gap you turned the screw to when you are not touching the controller at all, but it is turned on. if this doesnt fix it then reply and explain what happened and someone here will explain to you how to fix your linkage problem.

Dann