- Faulty spark plugs or ignition system: Worn or damaged spark plugs can cause the engine to misfire, leading to a rough idle and loss of power. Check the spark plugs for wear or damage and replace them if necessary. Other ignition system components that could be causing the problem include the spark plug wires, distributor cap, and rotor.
- Fuel system issues: A dirty fuel filter or clogged fuel injector can restrict the flow of fuel to the engine, causing it to run lean and rough. Clean or replace the fuel filter if necessary, and have the fuel injectors cleaned or replaced if they are clogged.
- Vacuum leak: A vacuum leak can also cause the engine to run rough by allowing unmetered air to enter the engine. Check the vacuum hoses for cracks or leaks, and replace any that are damaged.
- Malfunctioning sensors: Several sensors are used to monitor the engine's performance and adjust fuel delivery and ignition timing. If a sensor is faulty, it can send incorrect information to the engine's computer, leading to a rough idle and loss of power. Check the engine sensors for any that are damaged or not functioning properly, and replace them if necessary.
- Clogged exhaust system: A clogged exhaust system can restrict the flow of exhaust gases from the engine, causing the engine to run rich and rough. Check the exhaust system for any blockages, such as a clogged catalytic converter, and have the system cleaned or repaired if necessary.
