at exactly 3800 rpm is close - it is as if there were a limit

As I said, this is exactly 3800, not below it and is independent of speed.
On the highway (at about 178) I noticed it for the first time - it was like with a speed limit, if you stay on the gas then it starts to stutter.
When you get off the gas and get back on the gas, everything's back to normal.
That seems to be an electronic problem, doesn't it?!
Who can give tips?