1. Engine Misfire: A misfire occurs when one or more cylinders in the engine fail to fire properly. This can cause a rough idle and juddering. It can be caused by faulty spark plugs, ignition coils, or problems with the fuel injection system.
2. Vacuum Leak: A vacuum leak can cause a loss of engine vacuum, which can lead to a rough idle and stalling. Vacuum leaks can occur in various components, such as the intake manifold, hoses, or gaskets.
3. Fuel System Issues: Problems with the fuel system, such as a clogged fuel filter or a faulty fuel pump, can affect fuel delivery to the engine, causing a rough idle.
4. Throttle Body Issues: A dirty throttle body or a faulty throttle position sensor can also lead to a rough idle and juddering.
5. Engine Mounts: Worn or damaged engine mounts can cause the engine to move excessively, resulting in vibrations and a juddering sensation while idling.
6. Idle Air Control Valve (IACV): The IACV is responsible for controlling the idle speed of the engine. A faulty IACV can cause the idle to become erratic, resulting in a juddering sensation.
7. Exhaust System Issues: Problems with the exhaust system, such as a clogged catalytic converter or a damaged exhaust pipe, can also cause a rough idle and juddering.
It's important to have a qualified mechanic diagnose the specific cause of the juddering to ensure that the appropriate repairs are made. Ignoring these symptoms can lead to further damage and potential stalling issues in the future.
