How hard is it to replace the back manifold gasket on a 1996 Buick Century?

We have a 1996 Buick Century and were told the Back Manifold gasket is bad. It runs but only moves about 30 miles an hour. And how can we pull it home with a Tow Bar. No holes in Bumper to hook it to.|||For the gasket on a 1 to 10 scale ..it would be an eight meaning tough. You can't use a tow bar on these cars, you need a dolly or call a tow truck. Sorry|||Sounds like you have a V6 transverse engine. And you must talking about Intake Manifold Gasket as opposed to Exhaust. Assuming it is the Intake Manifold we are referring to, both banks share the same Intake Manifold so if you have a leak there you will need to remove the manifold to replace the gasket and/or O-Rings. Did you have a Check Engine Light code (CEL) warning light appear? And what was the code? It appears like you have a bad vacuum leak so before tearing up your intake, check all your vacuum hoses and anything connected with your intake manifold. Idle your engine and lightly spray carb fluid in suspected leak areas and see if it affects your idle.