Do I need a new Vacuum hose?

When I start my car I hear this hissing sound that sounds like air leaking out of somthing. It is also causing rough idle and when I drive it doesn't seem to wanna go above 4 k RPM's and its sluggish and the lights flicker so is this my vacuum hose or what?
Update: its a ford zx2 2000 has 130 k miles
2 answers 2