On 3.9L V6 and 5.9L V8 engines, the intake manifold gasket may leak and cause increased oil consumption and a spark knock during acceleration; the gasket should be replaced.Google+
Car Problem Reports
Dodge Dakota Increased Oil Consumption Due to Intake Manifold Plenum Gasket Leak
Dodge Dakota Problem
Engine Affected: 5.2L V8
Visitor, 1999 Dodge Dakota, 5.2L V8, 130,000 mi
Gasket between bottom plate of intake and plenum chamber failed. Engine ran well except for oil comsumption/quart@300 miles. Replaced gasket and problem solved. Sold truck at 203,000 mi with no further problems.