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Check the Mercury Villager manual to see if there is a special procedure for cleaning the fuel injector. If not, you can purchase cleaner. You can also have the injectors cleaned by a mechanic or an oil change company.
The brakes on the Villager are as straight forward as the brakes on a 1965 Mercury. Only normal brake tools are required.
You can use any standard antifreeze, there is no special type required.
You will need to buy a manual, since this is a complex procedure that would take many pages to explain. Removing the crank pulley will require special tools that the average mechanic may not have.
No, there is no "adjustment". PCM operate with pre-programmed firmware that is not designed to be modified, though it can be with special equipment. This is beyond the scope of the home mechanic, and would not be either a necessary or recommended procedure for addressing a problem.
The ball joints are bolt on parts that don't require any special tools to replace.
Unless the connectors screw together, this is not possible without special equipment.
Varices may require a special surgical procedure called balloon tamponade ligation to stop the bleeding
Unplug the sensor and unscrew it from the exhaust pipe. You'll probably need a special socket to do it without damaging the wires.
If the distributor was genuinely bad the vehicle would probably not run. It requires special diagnostic equipment to test a distributor in isolation.
There is no such thing as a 1987 Villager, I assume you mean a '97. The water pump is in the center of the engine in front, behind and above the crank pulley. To remove it requires that the crank pulley be removed, which may require special tools.
There is no special procedure, this is just a difficult one to do. Unbolt it, jack up the engine, then spend an hour or two grunting and getting cut up maneuvering it out and the new one in. It may (but not so much as I recall) help to loosen the other mounts.