The 2002 Dodge Caravan doesn't have an "idle screw" in the traditional sense like older carburetors. Modern vehicles, including the 2002 Caravan, use electronic throttle control (ETC). The idle speed is controlled by the engine control module (ECM) and not a manually adjustable screw. There's no user-adjustable component to alter the idle speed.
If you're experiencing idle problems, it's best to take the vehicle to a mechanic for diagnosis. The issue could be anything from a faulty sensor to a more serious engine problem. Attempting to adjust something that isn't there could cause more harm.
