2001 Chevy Express EGR

Let me see if I remember correctly: is the catalytic converter part of the egr system? I cleaned the upper end of the egr system and have the same results.

Right side as in passenger side?

Am I to take it completely from the block or just unhook it? I loosened it and oil started coming out. Will I lose a bunch of oil? If I remove it from the block, to I clean it out with carb cleaner to inspect?

Ok, I did not check it because I was waiting for a reply and it is dark out now. But I had a thought about looking at my ignition system in the dark. It looked like a christmas tree. I saw two for sure arcs in the plug wires. But it seemed to me that all of the wires were lighting up (seemed like inside the wire) all in the same places, for example where they might be near another wire but not touching. This was at idle. When I gave it some throttle it seemed as if it would go away in all places. Are the wires bad if they light up like that? I have tested my ignition stuff like this before, but never remember seeing wires act like that.

I would be happy if this was the issue and angry at the same time because it hasn't been long since I changed them and I thought I did a pretty good job.

So what makes the wires light up internally? I have never seen this before. And should I have been able to see the spark plugs lighting up too? Maybe I was just seeing the glow through the porcelain I dunno. I could not see all the plugs to make sure that it wasn't just the ones I was seeing, which was two out of two. I think the wires are still under warranty, hopefully they will let me swap and pay the difference for better ones.