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Question: Coolant Problem?

Coolant problem! No evident signs of leaks but using coolant. Have recently replaced the plenum and gasket that sits above intake manifold as old gasket was defective and coolant was visible & standing in the intake manifold. Once items were replaced, pressure tested the system and stayed at 14 psi. After the repair, I notice a popping noise when the car is heated and still uses coolant. Does the actual intake manifold need to be replaced due to being cracked or warped? Car has 148,000 mi