We did a little research (thank you Wikipedia) and it seems that there's a problem with this model name. It turns out that in the hierarchy of nobility, there's no such thing as a "grand marquis." It simply doesn't exist. Immediately above the rank of marquis is the level of duke and duchess. So, the only place in the world where you'll find a "grand marquis is the Mercury Motor Company. That being said, we still recommend giving yours the royal treatment and installing one of our high performance Mercury Grand Marquis throttle bodies.
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As the valve that connects the intake tube and regulates airflow into your manifold, your Mercury Grand Marquis throttle body is a vital component in your air intake system. With a high-flow Mercury Grand Marquis throttle body you get a huge dose of air to mix with fuel and this pays off with increased power and lickety-split throttle response. Installing one of the AutoAnything quality Mercury Grand Marquis throttle bodies is an easy task. You'll be done in no time, but you'll enjoy the enhanced performance for years to come.
Year Range For Mercury Grand Marquis Throttle Bodies