Hello guys due to random misfires on my engine after fixing otherwise every other problem that made itself apparent, I finally got around to pulling a spark plug to inspect.

For the most part the plug looked fine, maybe a very small amount of carbon buildup but the part that worried me is it showed signs of overheating. Nothing catastrophic to make me go OH ****!, but it had a small amount of blistering around the electrode porcelain.

Now normally I know this means I am running too cold of a plug, these are NGK plugs and the 7 heat range which was recommended by a well known name here. However, I am not going to immediately jump on the wrong heat range wagon due to the fact that up until only a few hundred miles ago, my car had ran for almost 3000 (The actually amount of miles on these plugs; less than a year old) miles on these plugs with a bad MAF sensor which was throwing the entire mixture to the lean side. The ECM would throw code 44 almost daily towards the end, and the engine would misfire BADLY until the engine was restarted.

After I replaced the MAF, all engine codes disappeared, and the misfiring greatly diminished. After I replaced the ignition coil, it further diminished, but there is still a tad bit left I am assuming from the damaged plugs.

If wanted, I can go pull the plug again and post a picture here. Mods to my car that could potentially affect the plugs past stock are headerback exhaust system and chipped ECM advancing the timing (Not my doing), but it is to my understanding the timing advance only kicks in at WOT.

What do you guys think?