Maf
Posting Guru
Joined: Oct 2005
Posts: 2,209
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From: Louisville, Kentucky
There is a vacuum accumulator behind the battery. Sometimes corrosion build up on the battery terminals falls down around the sides of the battery and eats through vacuum lines going to and from the accumulator. Take a look there. Good luck! 
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xc4jokestomper
1987 - 1996 F150 & Larger F-Series Trucks
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Jul 28, 2010 08:58 PM
