maybe a stupid question but if a intake manifold gasket is leaking will it cause a rough idle? If so what should all be replace when removing a intake manifold. simple parts that could have gone bad that should be replaced when thats off.....any help would be nice. i know that i will need a car gasket and the manifold gasket. would it be worth replaceing the fuel pump while its off. it only has 88000 miles on it.