stumble/missfire/bucking solved

[red95gtconvert]

Hello everyone, my car had a stumble/missfire/bucking problem and was just running like crap in general. Well after changing out everything I figured I would check the sparkplugs out. Well to my suprise the ceramic section on one them had a huge crack in it, after changing out the bad plug my car runs amazing now. No more stumbling or missfiring and flat hauls the groceries now, I am very happy I finally figured it out, I was about to go crazy Just thought I would let ya know.

 

[HISSIN50]

When an issue arises, the first thing to do is pull codes. Part of that process is to run a cylinder balance test. This tells you which cylinder(s) is/are not contributing as much as they should. It takes all of 5 mins to know which cylinder needs to be diagnosed.

That said, I'm glad you got it figured out. I've had the same thing happen before. I also recently worked on a car with a miss. The plugs had over double the spec'd gap (gap erosion). It happens.