First check your kickdown switch under your gas pedal (I learned that one the hard way). Check my posts by clicking on my name. I made the mistake of going at my vac system willy-nilly; dont if you are doing the same. What are the symptoms exactly and people will help? Look at fastlane and performance products for vac hose. There's tons of prelim. information here to research re: leaks, proper pressure, cracked mod caps, vacuum control valves, etc.