The intake on my 1990 Turbo r seems to be leaking. Car runs fine above about 1200 RPM but has a skip at idle. Replaced a number of vacuum lines, plugs, caps and rotors. A little better but .... sprayed some starter fluid around gasket and got a lot better as long as fluid was being sprayed. Will replacing the gasket require a specialist-three hours away- or can a good general mechanic do it. Looks like just a matter of taking off layers of engine bits until the manifold is reached and then putting everything back the same way. How many hours should this take.?