One day i took my savage x out for a rip the first couple passes it ran fine, but then i started reving in bursts, every time i would give it some good throttle i thought it was the batteries but not the case checked the receiver and the wire, thinking it could have been the gas mabey some water got in there because it ran great for the first couple passes but then started reving crazy i even turned all my needles back flush and started over but still same effect anyone have any suggestions on this.