Hyundai i 10 is restless at constant speed

Hello, I’ve had a little Hyundai i 10 with 67 hp and a 1.0 l engine / special model Yes The car is exactly what I’ve been looking for, but there’s a little blemish. At a constant speed I have the feeling that the engine is running uneasy, the car has always felt small “power holes” as if you were going off the gas for a short time. This happens even if the cruise control is switched on. In the workshop the car was read out and no error was shown. I was told that this was due to the small engine and probably normal. Now that the car is not the fastest and needs something until it is on the road I can understand, but it should run evenly in the quiet operation. I would be glad if you could help me.