Finding a Vacuum leak

[renda10]

Hey everyone. I have a 2002 sport 4.0L and i have a vacuum leak somewhere. Whst is the best way to find it?

I need to fix this asap as it throwing codes as well as i am getting really erratic idles.

 

[rileyrs]

just play with the hoses while the trucks running, and listen to which hose changes the whistle of the vac, and thats the leaky one

 

[BrianDye]

Thats what mines doin, the little rubber gasket on the brake booster hose is dry rotted, so im getting like 3 codes, and horrible idles, makes it sound like a beater when I start it up LOL