Hi, new member and need some help. I boutht a nice 1986 420SEL and my wife has been driving it for a year. It recently has started to idle rough and economy guage indicates a vacuum leak. I took it to a local mechanic an he smoked tested the systems and said it needed gaskets a hoses from the intake manifold, injectors,fuel distributor, including vacuum hoses, for a price of $600. I would like to do the work myself but would feel more comfortable with a repair procedure for this operation. Does anyone know where I could get a procedure to do this? thanks John