Gas acceptance spins

Hello, I’m new here and have a problem with my runner c46. I bought it before a few weeks used and it went well but always when I drive over mud or potholes he suddenly takes no more gas. then I have to stop and give full gas and then go again or if I drive faster over it sometimes nothing happens and when I drive over slowly he takes no more gas. He is completely original. Have already cleaned up the carburettor. Again again set but the problem is still. I don’t know about the model and I don’t know what it could be. Maybe you can help me