There is no such part on a Mercury Villager.
yes!
Try this link: http://www.forddirectonline.com/partlocator/index.cfm?siteid=214462
Yes, it should fit.
134-a
Buy a manual.
No, there is no "adjustment".
4.2 quarts
walmart
Powertrain Control Module
1995 Mercury Truck Villager Van 3.0L EFI SOHC 6cylThe Spark Plug Gap.032 (In thousandths of an inch)
http://www.modifiedlife.com/1995-toyota-tercel-car-stereo-radio-wiring-diagram/