Ignition what? Switch? Coil?
Replace the ignition coil(s).
depends on which engine you have
Remove the wiring harness from your 1999 Mercury Grand Marquis ignition coil. Remove the ignition coil retaining screws. Reverse the process to install your new ignition coil.
there is a coil on each plug
IGNITION ? ARE we talking ignition coil-ignition wires ignition switch-key & tumbler.
pull the two bolts buy new or used ignition coil the replace the ignition coil is on th left side of motor right by the tbi
Replace the ignition coil.
Replace high tension coil wire. Probably time to replace all the spark plug wires.
buy a new one