NEVER...I repeat...NEVER use an air frequency in a gound vehicle. While your glitch problem is probably related to something other than the frequency, there is a reason radios are labeled for ground vs. air..

First, it's illegal.

Second, you may cause an R/C airplane or Heli to go out of control.

Third, someone flying their plane may cause you to crash your car.

Please go purchase an inexpensive car radio and receiver. You should be able to continue to use the servos you alread have.

Mark M.