If I exceed 4000rpms on a hill the engine will rev out of control and I must pull over and shut off the car and recrank it to restore it to running normally.If Ican keep it under 4000rpms until I reach flat ground it runs perfectly. Does my CVT need reflashing at the dealership or coulit be sensor that doesnt like the elevation change? It never happens going downhill.Sure would appreciate an "educated" guess! Thanks!!