vacuum system
 

hi guys

i'm trying to replace all the vacuum hoses on my 99 2.8l 30v v6 (or test them for leaks) because of engine roughness in idling. any suggestions, links to previous posts, instructions or photographs that could be found on here? or even advice as to why its idling rough (just seems to jump a couple hundred rpm while idling when warmed up)?

thanks in advance.