I got a problem, need help!

[Redneck427]

Ok, ive got a 4wd 1/10 electric buggy with a traxxas reciever, traxxas digi hi torque servo, mamba 4600 motor and sidewinder esc.

Whats happening is, Im turning left sharper and sharper and everything is perfect until I make that last step all the way to the left then the throttle stutters and wont hardly go, but then I turn back to the right a tiny bit and everythings perfect again. Its not mechanical binding, and I tried different transmitters with no change.

Anyone ever hear of this or have it happen to them?