I have a 2004 Buick Lesabre 3.8 with 178,000 miles on it. I changed the plugs last night, as it was running a little rough under load going uphill or getting on the highway. I also changed out the fuel filter, which wasnt clogged all the way, but could hardly blow through it. Since those two things were changed it runs great.
When I pulled the plugs out I noticed some discoloration that I have never seen before. Was wondering if any of you guys have seen plugs like these.
When I pulled the plugs out I noticed some discoloration that I have never seen before. Was wondering if any of you guys have seen plugs like these.