Ford Focus MK2 1.8 16v 125PS Duratec HE - High RPMs After Ignition and Slow Gear Changes

Hello. I have a problem that after firing, it goes into high speed 2,000 for a while is one thing and the other is that it comes down very slowly when changing gears. The first thing I did was clean the throttle even though it was very dirty. I did a throttle change with my brother and he did the same. All vacuums checked. The car is Ford Focus mk2 1.8 16v 125PS Duratec HE. Do you have any suggestions, what else can you check?

check the tightness of the pipes to the collector going and their connections, flow, stepper motor, checked?

I had the same thing with holding high revs when changing gears, but in a different car (BMW) and there was a disconnected clutch sensor on purpose, but I don't know if you have an electronic throttle or a cable. if you have an electronic throttle, maybe the throttle adjuster raises it too much and goes into rotation and you need to check what causes it, because replacing it sometimes will not improve anything.

I was at a mechanic today and he puts on a pneumothorax, but unfortunately for this procedure you have to remove the intake manifold, apparently the age-old problem with rotation in DURATEC HE is a bursting pneumothorax and it catches the left air.