These cars need a lot of attention to be kept running smoothly, but once they're running well you can't help but fall in love. :)
If you have any doubts that the plugs and wires aren't in good shape that's a good place to start. It's crucial that you use motorcraft parts on these cars. The sparkplugs you'll need are autolite 764's if I remember correctly. It's also a good idea to check the cap and rotor for corrosion. They're not very expensive to replace with quality parts.
If the idle problems are still there after you've done that - this would be the next step:
http://www.turbotbird.com/techinfo/i...djustment.html