What timing! Not 2 hours ago I just finished the same job. My #2 plug tested bad; glow light would not come on until after engine was started, and it ran rough for the first 30 seconds. Since my plugs were 8 years & 90,000 miles old (found old receipt from PO), I decided to replace all, not just one. Testing the things was hard enough with the fuel lines in the way. I don't see how anyone can replace these w/o removing the intake. I got the 2 gaskets and plugs and a couple of fuel line clips prior to starting.

You don't need to remove the fuel lines - the manifold will come out around them - only remove the fuel line bracket that attachs them to the manifold. I did not remove the crossover pipe either. It will stay attached to the turbo. Remove the throttle linkage as one piece and lay to the side. No need to remove the throttle cable from the linkage. The linkage rods will separate at the ends relatively easily. The plugs themselves were the easiest part, once the manifold was removed. They were not too tight and there was no crud on the ends. I used some antiseize on the gp threads for good measure. The hardest part was finding the 3 bolts I dropped down below. The lower bolts on 2&4 were the hardest to remove and get started again. I bought at the last minute a hex key set with a ball type on the long end so you can use at an angle. It was invaluable. I wish I had a 1/4" inch drive 6mm hex socket, but I had to make do with 3/8". I would recommend a very long hex wrench, maybe with a t handle.

Overall it took me 5 1/2 hours, which was the same as the dealer charged the PO, so I don't feel too bad. Don't know the book time for this job. While I was in there, I removed the cover off my "virgin" alda and gave it a 1/2 turn CCW - it's always been a little sluggish off idle. Do yourself a favor and replace all gp's - I wouldn't want to do this again for a while. Also, test the linkage for binding and interference before you tighten everything up.

I could tell from my test drive that the alda tweak made some difference. It will do for now. It was not possible to access this with the manifold on.
Good luck!

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BillS