Rough-idling 360, can't figure it out!

Look for Weak ignition. Check all grounds, power at coil.
At idle pull vac on the egr and see if the idle gets shitty, you know its working if it does.
Change the coil for one that's good., bypass the ballast and try it.
Octane boost helps old gas.
Vise grip close all vac lines and see.
New plugs?

Make sure idle mix screw are identically set!!