No, I got most of the parts from my mechanic. I've always been wary of the e-bay tune up kits.
The rough idle has been fixed. I tried a few things - some fuel injector cleaner and a new air filter, as well as the good ole' "Italian Tune-up" and it worked wonders. Basically, I drove the car until the engine was warm, found a long, steady hill and hit the throttle. I ran the engine hard and it belched out some black clouds a couple of times, then ran clean. Ever since, the idle has been very good. It's hard to tell what worked, but it was probably a mix of all the things I tried...
As far as copper vs. platinum, I've been warned off the platinum plugs for my car by many qualified people. The M103 engine was not designed for platinum plugs - the copper ones are best.
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon