mine did that also, was to lean on top. as matt said recheck that idle gap and make sure when applying brakes your not forcing it to close to far. I also had that happen to me. the new high torque servos are great for brakes but are a little hard on the carbs,IMO. I had a hitec digital that was 177.0 oz's. of torque that really would want to pull the engine when I applied full throttle and vice versa. I went and set the epa at 65% seems fine. I also adjust my idle gap with batteries fully charged and brakes applied.