What should I be looking at to diagnose my Ford Ranger which surges when stopped? This typically only happens while the vehicle is warming up. After that, it's fine.
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My first thought is to clean the throttle body and Idle Air Control (IAC) motor passages with carburetor or throttle body cleaner. They get a black buildup on the edge of the throttle plate and IAC passages that interferes with the idle speed regulation. |
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As Larry said, check the throttle body and the IAC, but I'd also check for vacuum leaks. |
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