106 GTI Idle ripple

While the vehicle is cruising, it kicks very lightly, then straightens, and when it is in motion, the idling fluctuates but does not stop. The idle fluctuates constantly when operating in a normal fixed position, the intake manifold has been repaired and air leaks, the throttle is cleaned, the injectors are cleaned, the idle sensor has been checked. How long did the intake manifold have such a condition as its original mirror, they said it would be repairable, would you be healthy?

Thanks in advance for your valuable comments.

Throat butterfly and sensors cleared did not improve. Idling sensor was changed to zero, again it did not improve. The intake manifold was repaired, the problem was not solved, when we connected the vehicle to the device, the oxygen sensor was malfunctioning, 3 repairers could not solve the problem together.