OK, this is the first time Im gonna turn a wrench since my finger was cut off so where better to start then the 8 lil candles that fire it all up? So I take out #5 Plug first because I noticed a small coolant leak on that side of the engine at the front of the intake (3rd time btw) and its grey and ashen, I move over and remove #1 plug and it looks the same grey and ashen looking, so.. is this grey look caused by coolant leakage or injector cleaner or what would it signify