Thanks for the tips. Did my '99 Windstar the other day. Sticker under
hood recommends .52 to .56 for the gap. Boy the old plugs were really worn.
Some were at .100. Anyway, I tried both methods for the rear plugs. Under the car for 2 & 3, and through the wheel well for #1. It was tight, and I needed
a boot puller for #1, but success at last. Also used the dielectric grease that
somebody mentioned.
Running like a top now.