Where are the spark plugs located in a 1998 Mercury Grand Marquis?

THE SPARK PLUGS ARE UNDER THE INGNITON COIL PACKS MOUNTED ON THE VALVE COVERS. THERE ARE NUTS THAT SECURE THE COIL PACKS, YOU WILL NEED TO REMOVE THESE COVERS TO EXPOSE THE COILS WITH A SPARK PLUG BOOT MOUNTED ON THE END. WHEN REPLACING PLUGS BE VERY CAREFUL NOT TO DAMAGE THE ELECTRODE BOOT. SOME PARTS STORES CARRY REPLACEMENT BOOTS , SOME REQUIRE THE COMPLETE COIL REPLACEMENT WHICH CAN BE VERY EXPENSIVE.