Why does my car idle rough or shake when stopped?

A rough idle when stopped usually points to engine misfires, a vacuum leak, dirty fuel injectors, worn spark plugs, a clogged air filter, or a failing idle control or mass airflow sensor. When your car idles, the engine runs at its most vulnerable speed, so even small issues show up as shaking or an uneven rumble. A vacuum leak lets unmetered air into the engine and is a frequent culprit, while old spark plugs and dirty injectors disrupt clean combustion. Miami's stop-and-go traffic means your engine idles a lot, so these problems get noticed and worsen here. Left alone, a rough idle often grows into stalling, poor fuel economy, or a check engine light. A proper diagnosis pinpoints the exact cause rather than throwing parts at it. Motoro Cars diagnoses rough idle precisely across 40+ brands. Book a diagnosis at motorocars.com or call Wynwood at (786) 634-2002 or Doral at (786) 633-3220.