Engine oil leaks from the valve cover gaskets, timing cover gasket, intake manifold gasket, distributor o-ring, and rear main seal area are common. The leak at the rear main seal area is generally not the seal itself but the bearing cap to the engine block seal. An oil leak could also be internal to the distributor, if oil is found inside the distributor then the distributor should be replaced.
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Repairpal verified 1991 Dodge W350 problems
Hard Starting, Rough Idle, Black Exhaust Smoke, Poor fuel mileage may indicate a leaking fuel injector or more commonly a leaking injector O-ring. Our technicians tell us that with engine idling look into the throttle body with a flashlight, If fuel is seen dripping from around the injector, the O-ring is likely leaking. If fuel is dripping from the injector nozzle, replace the injector.