I just bought this car for my wife to restore and am trying to figure out why it idles high and shakes. It has new plugs,rotor,cap,wires,air filter. Could it be vaccum leak?
Also it seems there is an lack of power when you start from
a dead stop. I am very mechanically inclined and would greatly appreciate some advic. Also at about 20 mph there is a rumble that feels like its in the rear? could that be some kind of U joint or something? Otherwise its a beautiful car. I also bought a manual but it only covers the 6 cyl. I cant even find where the timing marker is.

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1972 280sel 4.5