Q: Car idling high and rough

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After I replaced the spark plugs and cleaned the throttle body, my car started idling high and rough.

The cleaning of your throttle body may have caused a vacuum leak in the intake system. It’s also possible that an improper hose reinstallation to the throttle body is causing unmetered air between the throttle body and the mass air sensor. I would recommend having a mechanic, such as one from YourMechanic, run a diagnosis on why the car idle is rough, and recommend the best path to repair.

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