What causes a car to run rough?
Car Runs Rough Car Overheats Troubleshooting Reasons for Car Overheating Blown Head Gasket Symptoms Signs of a Blown Head Gasket Reasons for Engine Overheating Car Problems Overheating Engine Runs Rich Temperature Gauge Diagnosis Reasons for a car running rough can include problems with the engine temperature or oxygen sensors, bad hoses, ignition system or timing problems, clogged air or fuel filters, and faulty spark plugs or fuel injectors. Many problems that manifest through a rough idle can be easily fixed. If the engine temperature sensor fails, it sends the wrong temperature signal, and the result is a fuel mixture that is too lean, which makes the car run rough. As the weather warms up, this is rarely a problem. A failing oxygen sensor can also cause a car to run rough while idling, but it won't affect the car while driving. A bad hose in any part of the engine is easy to fix. Sometimes, vacuum lines cause a rough idle due to a vacuum leak, and these lines ...