Failure of plastic vacuum lines on Ford Bronco

Vacuum hose failure is common due to engine heat and time.  Vacuum hoses are made of plastic.

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Average mileage: 128,833 (63,000–169,500)
Exhaust & Emissions affected: 5.0L V8
3 model years affected: 1991, 1993, 1995
5 people reported this problem
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Viewing 1 - 4 of 4 problem details
When I come to a stop light the motor wants to surge up and almost stalls
1995 Ford Bronco 169,500 mi,
All vacuum lines are failing. all plastic lines are britle. starting to replace one by one. haveing trouble finding a good diagram to work off of.
1991 Ford Bronco 63,000 mi,
Lines are brittle
1995 Ford Bronco 154,000 mi,
while changig spark plugs, i had to move plastic vacuum line, and the plastic vacuum line where no longer flexable, they where very rigid and brittle, as a result they broke very easily.