I am building a Sig 4 Star 60 and am almost finished. I just connected the throttle cable to the throttle barrel on the engine and the cable runs freely.

When using my radio to advance and retard the throttle, it works just fine.

At throttle closed position and throttle wide open position, I get a buzzing from the servo that can be stopped by slightly advancing or retarding the throttle on the radio.

Throttle cut works fine but also buzzes when on.

Cable is not impinging and runs freely.

Am I worrying about nothing?