i'd say... (and i am not an expert and i fully expect the experts WILL chime in soonest)
it's possibly the bad parts could be making some of the noise, but as you said, hard to know without actually being there. you should get those taken care of kinda quicklike.
idle vibration... have you done a tune-up to it yet?
let us know of any status updates after things have been replaced, and whatnot...
good luck and Welcome to the Z.