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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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up vote 5 down vote accepted

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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Thanks, I'll give that a try. – Valdis R Jul 12 '11 at 19:29

As Larry said, check the throttle body and the IAC, but I'd also check for vacuum leaks.

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