Yes.
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )
99 G/M has no filter.
( 5 quarts with filter change ) according to the 1999 Mercury Grand Marquis owners manual
According to the 1999 Mercury Grand Marquis Owner Guide ( and one of Ford's websites ) ( Motorcraft FL-820-S , engine oil filter )
On a 1999 Mercury Grand Marquis : The Mass Air Flow Sensor should be between the engine air filter and the big engine air intake tube
Change the spark plugs, air filter, fuel filter, that's it. Of course, engine oil and filter.
IT's the small plug on top of your air filter housing.Unplug it and it pops out.
According to the 1999 Mercury Grand Marquis Owner Guide : # 16 is a ( 20 amp fuse ) for the cigarette lighter
On a 1999 Mercury Grand Marquis : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
According to the 1999 Mercury Grand Marquis Owner Guide : ( " regular " unleaded gasoline , 87 octane )
According to the 1999 Mercury Grand Marquis Owner Guide : ( 71.9 liters / 19.0 U.S. gallons )
According to the 1999 Mercury Grand Marquis Owner Guide : ( 5W-30 engine oil , certified for gasoline engines ) With engine oil filter change ( 4.7 litres / 5.0 U.S. quarts )