Guys, the stang seems to be running good, but the engine light is flashing in the cold damp mornings but not in the hot sunny afternoon. A mechanic buddy told me flashing means misfire. So following an old tip I heard, I popped the hood in the dark and to my surprise , I could see blue spark at all 8 plugs. Not at the wire but at the plug. Can not see actual spark but I can see blue light. Is this normal? Are my wires not heavy enough?