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The servo corrects itself when he turns on the car. And he has swapped cables on the Rx and found out it's the Tx. Problem solved.

Yeah.

The Flysky GT3B is cheap, and a great radio. I just bought a second one off Amazon for $43. Receivers are only like $9 each also.

So when you swapped wires, I assume the throttle worked with the knob, but the steering wouldn't work with the trigger? If so, bad trigger in transmitter.

So are you saying the throttle will move with the trim button? If so, it sounds like the potentiometer for the trigger went bad. It this a nitro RC? You mention idle, but it's hard to understand what you are saying.