look on the very top of the motor and you will see a long rail them are the spark
injectors for your spark plugs. pull them injectors out and you will see your spark plugs.
they are located under the coil pack
Bad Rings. Get your Rings replaced asap.
Change the spark plugs, air filter, fuel filter, that's it. Of course, engine oil and filter.
Beneath the coils. There are 8 coils. 4 on each side. Remove the coils (gently), then remove the plus.
.054
Screwed into the head.
You should have C.O.P. ( coil on plug) there are no wires.
On a 1999 Mercury Grand Marquis : It has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils One coil for each of the eight spark plugs firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Beneath their coils.
8 spark plugs platinum plugs were standard from the factory plug replacement requires a bit of work. coil-over plugs sit under the fuel rail so removal of the fuel rail may be necessary. take care when performing this task at home. each coil over is about 38$ (2011 price)
Use a 1999 grand marquis gs key!!
Check the ignition coil on the Marquis. Check the crank sensor as well. One of these is probably bad.