Stop in for a cup of coffee

Rainy Day Auto said
Its a ford 460 1991 in an F-250

anyone know of any common vacuum leak problems and where to look ??

Is fuel injected.
Dont recall what it has for an intake/plenum but it wouldnt suprise me if its leaking.
Also egr could be an issue.
Woukd need a better description of the trouble,rich/lean/hot/cold,you know give me something to think about.