engine vibrations when in Park

[94bmw540i]

I am new to DIY kind of jobs. My 94 540i shakes when in Park or Neutral. Does anyone have any suggestion/ideas where to start looking. I have changed engine mounts couple days back hoping that will resolve the issue but with no luck the right mount was as good as new but left mount underneath the power steering side was all squeezed. Trans mount looks good and I am on my way to change all the spark plugs. I hope that takes car of it. I was reading through the website to adjust AFM, where would I find a exhaust gas analyzer and 0.002" feeler gap gauge???. Also does anyone know what size of socket to use for replacing spark plugs? Can ignition coil be fouled, if so how do I check if it is.

Any help will be greatly appreciated.