He is a problem can anyone solve it - I have an XRAY with a 7 double Reedy Kription, Yokomo Reedy Batteries, Gt7 Speedie, 3PK HRS Radio, Futaba Servo Small one, at half throttle the engine is surging off and on off and on which is causing the car to severly run off the rails it has a mind of it's own. Any comment are muchly appreciated.