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Vacuum leak. Intake manifold. 4.7. Took my truck in to get valve cover gasket‘s guy at the shop said I had a vacuum leak crack in my intake manifold. He says it’s a common thing for 4.7 how can I find these cracks
 

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Morning Craig all.

Two easy ways... Spray Carb cleaner on suspected areas and listen for engine rpm change. Use a piece of heater hose like a stethoscope moving one end around the suspected area with the opposite end at your ear. Audible "hissing" should be heard in the defective area.
Good luck and have a great day.
CFee3
 
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