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Definetly vacuum problem, either torn line, bad vac. pump, or like my truck it was leaking at the hub bearings relaced bearings and been fine ever since.
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 3/28/03 F250 6.0L PSD ,TORQSHIFT,CC,SB,FX4,LARIAT
Charcoal Gray/Black,
Tint,RhinoLined,Sirius,Roll&Lock,Strobes,
SCT X3 Custom Tuned by Innovative, 
MBRP Stainless 4" Turbo Back,
ISSPRO Pyro,Boost, & Trans Gauges
Prodigy Brake Controller,Remote Start and Turbo Cooldown,
High Idle Mod., PM-13A on the Oil Pan,
HFCM Plug Upgrade,DieselSite Coolant Filter,
Energy Suspension Bushings,& Stanadyne every tank
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