hello how can i stop the above aircrafts from accelerating down the taxiway/runway on its own,,thanx,,

Dont have an answer for you partner.Just letting you know I too have the same problem.Also,when I start the engines,the AC spins around like the engines are full throttle and the rudder is fully turned one way or the other.I tried tweeking the thrusts and a few other areas to no success.