A little dielectric grease on the low voltage connectors at the coil packs won't hurt either, seal out some moisture.
If your replacing coils, as stated earlier, don't bother with the expensive MSD or other aftermarket brands, no gain, also applies to the plug wires, OEM work as well or better and fit better than aftermarket. Anybody bother to try those E3 plugs they are advertising like crazy. bet they aren't any better than the stock plugs either LOL

 

thanks for this write up thats good info to have and i'll be looking at mine doing the grease thing to just to be nice to my Monte

 

My engine did the same thing with a clogged cat. The coils are encased in epoxy and are VERY weather proof. Use dielectric grease on the coil towers (not silver terminals) and the orange gaskets between the coils and ICM. The insulation on the coil windings will deteriorate with heat from the engine. I used MSD for a year and saw a decrease in both throttle response and MPG.