What Causes Sudden Engine Stalling at Idle?

[LaMalia]

The causes of sudden engine stalling at idle are as follows: Clogged idle air jet: A clogged idle air jet, malfunctioning idle system, weak spark in individual cylinder spark plugs, poor valve sealing, intake manifold leaks, incorrect ignition timing (too early or too late), or improper idle adjustment. When the engine idle is unstable, the first step is to adjust the idle speed. If the issue persists after adjustment, check whether the idle jet and idle air jet are clogged. If the jets are clogged, clean them with gasoline or acetone and blow them out with compressed air. Intake manifold leaks: If the jets are not clogged, stabilize the engine at a certain speed and listen for leaks at the intake manifold or the middle/lower gasket of the carburetor. If leaks are detected, they can be fixed by tightening screws or adjusting the gasket thickness. If unstable idle is accompanied by a decrease in engine power, further inspect the spark plugs, valve sealing performance, and ignition timing. If necessary, perform repairs or adjustments.