I'm going to bite the bullet, as it were, and try and replace my spark plugs and coils this weekend.

I've ordered a set of ten Accel Super Coils ($300 for the set of ten) and will be using Motorcraft AGSF22WM plugs.

I've downloaded the Autolite video on how to change out these plugs to my iPhone to review again and again.

Question: The video says to "crack" the plugs loose 1/8 of a turn and then apply some spray carb cleaner and let that sit for one hour (or longer) to dissolve the carbon.

Would it not be better to first squirt in some bolt loosening solution and let that work for a few hours and then try and crack the plug loose?

Then, apply the carb spray for the carbon and wait until the next morning.

Thoughts on this, anyone?