How to disassemble the intake pipe of Mercedes-Benz 274 accelerator?

Dismantling the engine intake manifold includes separating the car body, fixing, opening the buckle, opening the intake manifold, taking out the air filter, then removing the whole intake pipe, the throttle valve, the mounting screws that fall into the intake manifold, and the manifold! The intake manifold is located between the throttle valve and the cylinder head, but before disassembling this intake manifold, the air passage connected with the throttle valve must be disassembled before disassembling the intake manifold. This step can't be omitted, otherwise the throttle can't move freely.