On a 1996 Grand Marquis, the idle adjustment screw is typically located on the throttle body. It may be near the front of the engine, often near the throttle linkage. To access it, you might need to remove any air intake ducts or cover that obstructs the view. However, it's important to note that many modern vehicles, including the Grand Marquis, have electronic throttle controls, so there may not be a traditional idle adjustment screw.
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