Genltlemen and ladies,
I think I will officially get myself out of the DIY club!!! I can't even pour oil in, the right way. When SteveBfl , mentioned oil leak, I remembered that when I had poured the oil I had spilt some on the exhaust manifold area, so I opened the hood and really analyzed ,turns out that , that oil kind of oozed down the pipe on to one of the Cats ( right side) hence the smoking. As for the rattle, it turns out that it was the A/C idler pulley, which I had changed earlier this after noon. As for the high idle, I pulled out the idle control computer and reconnected it after checking it out, and now it idles at 600 when in gear and 800 when in P/N. In the time that I have owned the car, never has it run so well!!!!! You can't tell the car is running !!!!!! I must thank SteveBfl for his diagnosis, otherwise I would have never realized that it was my mistake with the oil. I also balanced the tires because the was some severe shaking past 60mph, it drives much smother , however there still is some vibration at about 65. ( The car needs a wheel alignment.) That could be a contributing factor right??
To bad I am not moving close to Gainsville,SteveB I'd love to be bringing my car to you. Know anyone around North Bay Village/ Miami area who knows about Merc and doesn't charge crazy??

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**A few Hondas etc... etc... Not Worth Mentioning**
83 Euro W126 380 sel Money Pit (Sold)
91 W124 300e 2.6. (Sold) 3.0 Motor is Much better!!
93 BMW E34 Touring Wagon (Sold) Sweet Car!!
91 300e (Just 200k with Ease.)Best car ever ???(Sold)
90 420sel (Black with Tan Interior) Best car ever!!!!!!!