Why is my steering servo shaking?

Try taking the servo horn off and see if it still glitches. While doing that, zero your servo by adjusting your trip on the transmitter to zero and then reinstall the horn. If that doesn't work, you may have a bad servo. Hard hits will damage the receiver AND servos. Glitching is common but usually goes away when you zero the transmitter and servo horn. Good Luck! Hope this helps!