Why does the engine stop when taking a hose off of the intake body?

When a hose is removed from the intake body, it disrupts the air-fuel mixture entering the engine. This can lead to a significant drop in air intake pressure, causing the engine to receive insufficient air to maintain combustion. As a result, the engine may stall or stop running due to the lack of proper air-fuel ratio essential for operation. Additionally, if the hose is part of a vacuum system, its removal can create a vacuum leak that further affects engine performance.