The car began like it was lunging forward while driving.
My old man had the same problem. His car jerked around 30 to 40 mph and it turned out to be one of the injectors.
SOURCE: 2007 Mercury Grand Marquis required oil weight
If u have a moderate climate, 10W-30W, if cold climate 5W-30W, do not use any heavier weight of oils.
SOURCE: 1994 Mercury Grand Marquis Check Engine Light Code 332
its the tube going from the egr valve to your exhaust it have carbon build up and you either have to replace it or get a metal coat hanger and clean it out.
SOURCE: where are the spark plugs located on a 2000 Mercury Grand Marquis
There are eight COPs (coil-on-plugs) to remove. Using a 7mm or 9/32" socket, remove each bolt securing each COP to the intake manifold on top of the engine. Remove all eight COPs, and the spark plugs are underneath. When replacing the spark plugs, use only the proper Ford/Motorcraft plugs, even if they cost twice as much as the aftermarket ones. You will avoid further headaches this way. Hope this helps.
SOURCE: how to replace starter +1993 Mercury Grand Marquis
disconnect battery,,jack car up,,put jack stand on frame,,take starter bolts out,(may not be easy),,take wires off starter,,hoped it helped,,
SOURCE: While driving down the road in a 2007 Mercury
POSSIBLE CAUSE FAULTY HEADLIGHT RELAY OR CHECK FUSE AND CIRCUIT BREAKER TERMINALS FOR CORROSION.IF ALL IS GOOD CHECK FOR POWER AT HEADLIGHT SWITCH IF YES YOU HAVE FAULTY HEADLIGHT SWITCH OR DIMMER SWITCH. NO POWER TO HEADLIGHT SWITCH LOOK FOR BLOWED FUSE OR BAD HEAD LIGHT RELAY.
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