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What engine? and ensure it is a bad gasket, not an intake plentum.
there is no upper intake gasket, only a front and rear
jaguar 2001 Lower Engine Intake Manifold Gasket
The right tool's, and a new gasket.
Pretty straight forward. You must remove the intake manifold in order to replace the gasket.
The optional 5.7 engine used in the '90-'93 Cadillac Broughams is the Chevrolet 350.
The Intake gasket is leaking, NOT THE HEAD GASKET. Replace the intake gasket
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Irratic idling condition is indication of intake/inlet manifold gasket leak. Change gasket immediately. This particularly applies to EFI engines. Newaz.
Yes, change both of them.
No absolutely not...
take it to a mechanic