+1 NGK Iridiums...a must do!
I changed my plugs out last night...temp dropped a whopping 9 degrees from 102 to 93 in the garage from 7 to 10 pm. Needless to say that the heat made me angry...and my car hadn't been running for 24hrs!
Anyway, the job was a 6 on a 1 to 10 scale. The hardest part was reinstalling the front two coils on both sides (I have a '96 300ZX TT so I know all about working in tight spaces.) No give reinserting the coil packs between them and the brake lines on the P-side...had to work some magic. On the D-side, you DEFINITELY have to move the power steering reservoir to reinsert the first two coils...I tried not to and finally gave in.
Total time took me around 3 hrs. 80% was on the front four...the back were cake. I could do it again in around an hour but not on a hot Louisiana summer!