Okay, I finally made time to do the basic plugs, wires, cap, rotor. Still have not double checked the new sensor readings or messed with the egr. I hope to get to that Wednesday or Thursday when I have more time. The idle smoothed out a lot compared to before. There was a slight stumble, now there is none. The low speed issue I was having, as described in the post above "romp, romp", drastically improved as well. It takes very, very light throttle to make it happen now. Almost so little throttle, I don't think I'd experience it under normal driving. However, the problem is still there so I'll continue to diagnose. Tomorrow I will double check that all wires are secured on the plugs and the cap, just as an extra precaution.
Here's the plugs I pulled
I'm concerned about their condition
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Somehow didn't get a picture of this one? Don't know what happened.I'll get one tomorrow.
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Sounds like an egr issue, you have the light throttle romp, romp? Just try unhooking the egr, plugging the vacuum line and capping the vacuum port on the valve and see if the issue changes or quits.
I will definitely give that a shot.