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This is a engineered problem that noone wants to know about. It happens on a variety of cars and some makes are so aware of it that the plugs to the fire wall are very costly so they never need replacing while the ones to the front are cheapies. Unknown to most motorists when a tune up is done they are charged for all plugs but in fact only 1/2 are replaced. Back to you problem it may be necessary to support the engine tranny assembly whilre you remove the engine/tranny mount to lower the engine enough to get to the plug. To fix the problem put the expensive plug in this spot.
CHANGE SPARK PLUGS.YOU NEED SPARK PLUG 3/8 SOCKET.YOU NEED SHORT AND LONG 3/8 EXTENSIONS.YOU NEED SPARK PLUG BOOT PULLER AND A SPARK PLUG GAUGE SET THE SPARK PLUG GAP.NOW CHANGE 1 SPARK PLUG AT A TIME SO YOU MIX THEM UP GET FIRING ORDER MIX UP CAR BACK FIRE WONT CRANK.ALSO CHANGE PLUG WIRES ALSO.
is it a DOHC V6 if so ur in luck their is probably a plastic cover on the engine remove that to gain access to the valve cover on the front bank. The spark plugs should be right in the center of the valve cover you'll need to get a 6" or so extension to reach down into the cylinder head to remove them the same steps for the spark plugs on the back bank (closest to the fire wall).
If you have 2 motor mounts on the front of the engine attaching it to the front of the car remove the mount bolt tie something a come along to the motor it will roll over toward the front of the car making it easy to work on the back of the motor
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