Neil, I find it is hit and miss. The throttle servo will get twitchy and then it will seem to resolve itself. I just don't trust my expensive motor to that receiver. I am thinking maybe it is becasue of the metal to metal contact on the brakes. Thanks for the help.
Mine acted similar. Just the throttle servo will twitch, and sometimes glitch. I will pull throttle or brake, and there will be a burst in the direction, back to neutral, and then back to where the input of the radio is telling it to go. Very annoying. Went back to the full size Rx, no issue. Put the micro in a touring car and it worked fine, moved it to a different 1/8 buggy and then is started glitching again just on the throttle. Mine does it with the engine off, but it gets worse when the engine is running.