1. Transmission Issues: If your car runs rough when shifting into drive or reverse, it could indicate a problem with the transmission, such as worn gears or a faulty transmission solenoid. These issues can cause harsh shifts and rough running, especially at low speeds.
2. Vacuum Leak: A vacuum leak can also cause rough running and idling problems. When the engine is in park, the vacuum level is different compared to when it's in gear, which can affect how the engine runs. Check for any leaks or cracks in the vacuum hoses and ensure they're properly connected.
3. Fuel Delivery Problems: If your car is experiencing fuel delivery issues, such as a clogged fuel filter or faulty fuel pump, it can lead to rough idling and performance problems while driving. Check the fuel system components to make sure they are functioning correctly.
4. Engine Misfire: A misfire, where one or more cylinders are not firing properly, can cause rough running and vibrations. This can happen due to various issues such as faulty spark plugs, ignition problems, or fuel injector issues. Check for any engine codes or perform a diagnostic test to identify the misfiring cylinder and rectify the problem.
5. Torque Converter Problems: If your car has an automatic transmission, the torque converter may be the culprit. It helps transmit power from the engine to the transmission and can cause rough running or vibrations if it's damaged or worn out.
It's important to have the problem diagnosed by a qualified mechanic as soon as possible to prevent any further damage. They can properly inspect the vehicle, identify the exact cause, and recommend the necessary repairs.
