Laurabee

Has anybody had a similar problem to their Micra 'kangarooing'? My 2003 Micra has been doing this for the past couple of years. It goes for weeks driving fine and then will start jumping at low speeds. I have to change down a gear and rev the car and it will drive ok again. I have taken it to a mechanic who could not find anything wrong with it. No engine lights are on and the car never cuts out. Help!