Ok, long story short: 3 mos ago, I changed plugs n wires, during the swap, one of the new plugs ceramincs got cracked, so I used one of the old plugs that was still in almost new condition. about a month later, I get random bogging down, no torque, mostly during acceleration, but then started getting worse to where it could happen if on the highway passing someone. so I decided to start small and replace the 1 plug that was from the old batch. bought a new plug, put it in and the truck was acting really bad, like it was running on 5 cyl. so I took the new plug out and made sure it was seated properly, and not damaged. put back in, same thing. removed it again and put old plug back in, no change. but since it was getting really late, I could just detect spark coming from the cap on the plug. thought it was the wire, tried 4 different ones, same thing. this morning, took the plug out and the end had a decent amount of carbon buildup and from the threads to the igniter was really burnt pretty good. (see image) also noticed the ceramic now was cracked, put the new one back in, and the sparking from the plug cap went away, but still runs like on 5 cylinders.
completely at a loss.
Tuesday, January 15th, 2019 AT 6:26 PM