The upper intake manifold gasket may fail, causing an engine vacuum leak and a high idle condition. A damaged intake gasket should be replaced.
Car Problem Reports
Ford Bronco Upper Intake Manifold Gasket May Break and Get Drawn Into Engine
Ford Bronco Problem
Engine Affected: 5.8L V8
Visitor, 1993 Ford Bronco, 5.8L V8, 125,000 mi
High idle. Ford dealer did a computer diagnostic pointing to a faulty intake manifold gasket. not repaired yet