I was doing a pull and was going from 2nd-3rd-4th. However, when I entered 4th the rpms shot up and I had lost power and my car jerked hard. I tried again to try and diagnose the problem and the second time I went into 4th the rpms shot down and my car jerked. I had only lost power for a second but then it came back and fourth was acting like normal. Any ideas?

Edit: It’s a 6spd