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Rough Idle Causes – Why Your Engine Runs Unevenly | OBD Spark Rough Idle Causes – Why Your Engine Runs Unevenly Rough idle occurs when your engine runs unevenly while the car is stationary. You may feel vibrations, hear irregular sounds, or notice unstable RPM. OBD Spark Insight: Rough idle is not just annoying — it's an early warning sign of engine problems. Top Causes of Rough Idle 1. Dirty Throttle Body Carbon buildup inside the throttle body restricts airflow, leading to an improper air-fuel mixture. Effect: Engine shaking and unstable idle. 2. Vacuum Leak Cracked or disconnected vacuum hoses allow extra air into the engine. Effect: Lean mixture causing rough idle and misfires. 3. Faulty Sensors (MAF / O2) Sensors send data to the ECU to control fuel injection. Effect: Incorrect readings lead to poor engine performance. 4. EGR Valve Problems A stuck EGR valve disrupts combustion by allowing incorrect exhaust gas flow. Effect: Rough i...