Don't post here much, but do use this forum a good bit, changed the plugs out today for the first time, thanks to "swartlkk" for the good DIY on plug change, what a great help, might be still trying to finish the job if I had not used that DIY, now that I've done it once it will take half the time period next time, thanks to all on this forum for all the great answers.

 

where is that thread

 

https://blazerforum.com/forum/tech-a...ilation-40425/
Here you go.
There is a couple extra steps on there that are not needed, but are helpful and good to follow, air hose, you can pass, taking tires off, pass, just crank the wheels around so you can get in there from under, jacking up, same, not necessary but can help with room.
The two rear most are easiest done from under, the middle on drivers side I needed to remove steering coupler, extra 10/20 mins work, you need to take that bolt right off to seperate it, don't drop it, it took me 30 min to find that darn thing.lol.

 

In regards to the plug on the drivers side middle. Autozone has a socket that does the trick without having to disconnect anything. Still a bit time consuming but beats disconnecting anything.

 

what socket