24 inch would fit if you don't plan on driving it over anything but perfect roads. 22 is probably a safer bet. Anything over 20 is ugly on a Grand Marquis.
Bad crank position sensor
Out of gas.
A bad cam or crank sensor can cause a no start, but the engine will still crank or turn over.
The 1998 Mercury Grand marquis has the 4.6 liter / 281 cubic inch Single Over Head Cam ( SOHC ) engine from the factory
A 1998 Mercury Grand Marquis came from the factory with the 4.6 liter ( 281 cubic inch ) Single Over Head Cam , V8 engine
A 1994 Mercury Grand Marquis has the 4.6 liter / 281 cubic inch Single Over Head Cam ( SOHC ) V8 engine from the factory
In a 1994 Mercury Grand Marquis : It came from the factory with the 4.6 liter / 281 cubic inch , Single Over Head Cam ( SOHC ) V8 engine
The curb weight of the Mercury Marquis is just over 4,110 pounds. That does not include fluids, passengers, or cargo.
Try to be more specific. They are all over the car.
Check the 2001 Grand Ams crank shaft position sensor first. If the sensor is bad then the engine will not get fire or start.