You probably need to clean your throttle body.
The best way to do this is to remove the throttle body from the engine so the back side of the throttle plate can be thoroughly cleaned with throttle body cleaner and a nylon brush.
CAUTION: DO NOT use a wire brush on throttle body components. DO NOT use any solvent containing methyl ethyl keytone. This type of solvent can cause severe damage to sealed bearings and other parts of the throttle body. DO keep the throttle body cleaner away from the throttle position sensor (TPS) and the idle air control (IAC) as much as possible or remove these items from the throttle body before cleaning.
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