1998 Ford Expedition vacume leak ?

1998 FORD EXPEDITION
167,000 MILES • V8 • 4WD • AUTOMATIC
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ARIESHEAD
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hey i got my ride out the shop with a newer block and heads put on it .... now my brakes dont work so well and they are saying its a vacume leak causing back pressure on the engine ? im not taking it back to them cause they do real shotty work so what can i do to fix and or diagnose the problem ?
Sep 27, 2009 at 11:35 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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