Engine surging

[Andrey]

Check your fuel filter and intake gasket. Our engines are known for bad " vaccum" leaks on intake gasket. This might contribute to your condition.

[Tone]

Idle control valve mounted on the throttle body could also cause this - it gets gunked up over time. It is held in place with 2 Torx screws and can cleaned with carb cleaner and checked for easy movement. May also want to take intake tube off and spray intake cleaner around the butterfly as gunk builds up there and could be preventing it from closing all the way. TPS could also cause this but the intake gaskets are notorious for this. Clogged fuel filter is unlikely to cause this behavior.