How do you tell if intake gasket is blown?

To determine if an intake gasket is blown, look for signs such as coolant or oil leaks around the intake manifold, which can indicate a breach. Additionally, listen for unusual engine noises or observe rough idling and misfires, which can suggest air or fluid leaks. A rise in engine temperature or changes in engine performance can also be indicators. Performing a pressure test or inspecting exhaust gases for coolant can provide further confirmation.