Update.
Had a little time today so I pulled the plugs and while they were not all black, all had a little bit of liquid on them.
Went ahead and got the engine warm in the driveway and tried to adjust the idle screws. With the air filter on I screwed the first screw all the way in and nothing changed. Then screwed the second in and nothing changed. Backed them out 1/4 turn. Removed the air filter and tried again. The idle did drop a little and it seemed like it was struggling just a little but not much. The popping never completely went away, but it was mess often and less pronounced. Took a drive down the road and I am still getting gargling/popping on deceleration between 1st and 2nd and between 2nd and 3rd.
Also checked the spark on 4 and it was a good strong spark jumping 1/2 inch. (BTW: Make sure the handle insulation on your pliers is good before handling live plug wires.)
Here are picks of the other 7 plugs to go with #4 above.
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