Remove the coils one at a time using a 5.5mm nut driver

Then just lift the coil pack off

Use contact cleaner if you have it to clean the contacts.

Use a small wire brush to scrub them clean on both sides.

Wipe the terminals to make sure they are clean.

Apply dielectric grease

Place coil back on terminals and tighten the screws. Note, do not over tighten them. Just snug.