On the underside of the actual hood, open the hood, look up at the metal underside. Most cases people are searching for theses labels in regards to EGR problems, the Ford egr code is very misleading, check your IAC valve for correct operation, but I would just replace the oxygen sensor first that is usually the cause of the problem.
Yes
You can find a vacuum diagram for a 1991 Ford Bronco 351 Windsor in a Chilton repair manual if the Haynes manual does not have it. You can also check with local auto stores.
http://www.mustangbarn.com/73vacuum.html
There is no such thing as a 2001 f250 351 Windsor. I believe the last year of the 351 overhead valve motor was 1996.
the diagram should be under the hood on the sticker with the emissions information
A local Ford dealer should be able to supply the needed diagrams for the vacuum system of 1986 Ford 351. They keep these items on hand or know where to find them.
The only 351 that ford offered in the F250 was the Windsor. The 351 windsor was put in the ford trucks from 1983 to 1986.
The egr valve on the 351 engine is located on the left side of the throttle body on the top of the engine.
( .044 inch ) according to motorcraft.com
26.4 pints or 11.2 litres
yes,the 351/5.8,302,289,260,are the same
get a Hayne s repair manual they have the best diagrams