So I pulled one of a spark plug out and the bottom part looks very black. I’m assuming that’s not how it supposed to be. So I need help on that... like what’s the problem and how to fix it? second problem that I’m seeing is coolant that seemed like it was around the oil pan. I cleaned and...

Hi guys, I need advice on determining what the spark plug gap should be on my car. I've been reading around to look for clues, but have seen mixed answers from .032 - .035 and .040 - .050 So I'm a bit confused on what I should set the gap for my spark plugs to. I know it's not a one size fits...