Tim, its funny you mentioned that because I had the same exact issue in our 2nd race of the season lol. That was just a case of me being a noob and not checking my bearing set screws. Had a few of them fall out and the axle shifted and rotor started rubbing the brake pads. That was more of a gradual feeling though and it bogged the engine down. This new issue with left turns its like the engine completely shuts off for a split second.