New plugs, wires, cap, rotor. Make sure you have the right plugs. It will make a difference. After that new motor mounts will almost certainly make a difference too.

__________________
DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV

How would motor mounts effect the idle speed?

Motor mounts won't affect idle speed but they will smooth it up a bit. If the mounts are weak tiny imperfections in the idle seem to magnify.

__________________
DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV

The motor mounts definitely are old, but the idle swings pretty drastically. I replaced the plugs. Haven't done the cap, rotor, or wires yet. I dropped 60 bucks on that EHA to get one locally. Why are plug wires for these so damn expensive?