[wiswind]

On my '96, 3.8L, I drove the front wheels up onto steel ramps....Put the transmission into PARK, set the parking brake and also blocked the rear wheels.
Then I was able to easily get at the 3 rear plugs from under the vehicle.
One tip.....I like to remove ONLY 1 spark plug wire at a time ......so that it is pretty hard to plug them into the wrong spot.

Ignition module.....I would NOT replace that unless there is a specific failure wiht that.
The ignition module is part of the computer.......which is why they call it PCM, Powertrain Control Module.
In other words.......that would be the whole computer module.
The PCM drives the primary side of each of the 3 coils in the coil pack directly.
There is +12 Volts sitting at 1 end of the primary winding and the PCM connect the other end to ground for a short time when it is time to fire the spark plugs connected to it.


I am guessing that what was being refered to was the Coil Pack.....which is where the other end of all the spark plug wires plug into.
Those seem to be a common failure item.....so Replacing that while you are doing the spark plug wires is a good idea....since you are there anyhow.
The coil pack contains 3 coils......a spark plug connected to each end of the secondary (high voltage winding) the coil......so 1 end delivers a positive charge spark and the other end delivers a negative charge spark.
What this means is that 1 end will wear the center electrode of the spark plug more and the other end of the coil will deliver a spark that will wear the ground tab more.
THIS is why you need the DOUBLE platinum spark plugs, which have the platinum enhancement on the ground tab as well as the center electrode.
The double platinum spark plugs will wear more evenly over time.
For messing with the coil pack (which you have to if you are replacing the spark plug wires), removal of the windshield wiper cowl is a big help.
TAKE YOUR time and be careful to avoid plugging the spark plug wires into the wrong spots on the coil pack.....has been known to happen as it is easy to do.

As a side note....changing the spark plugs in my Windstar was MUCH easier than on my 2003 Toyota Sienna........as each spark plug has the coil right on the spark plug, I have to remove the upper intake manifold to change the rear plugs (on the Sienna).
With the upper intake manifold in place, there is not enough clearance to remove the coil from the plug.
Like the Windstar....the plugs are rated for over 100K miles....and I made SURE to use the correct plug for the vehicle.