Automatic Transmission problems of the 1999 Cadillac Catera

I have a 1999 Cadillac Catera. It has been the most trouble some car I have ever had. The engine light comes on and reads mutiple cylender misfire. Also I had to replace the rear main seal at 60,000 miles. Which was six months after I bought the car. It costed me $600. 00 to fix it. I also have alot of blow by in oil. Also the cams are leaking a littel bit. I bought the car from whiteker murcurey lincon in west st. Paul mn. I did not even get a owners manuel. I called them and all they told me was the thirty day warrenty was up and there was notheing they could do. All I want is a nice running car not to get riped off. Now I have to spend more money just to get the misfire away. It still a new car but with to many problems it would be nice if Cadillac could give me a deal on the repairs. Remember I now have had it for only 7/mo. The dealer also told me they have had notheing but problems with the Catera. To late for who ever owns one.

Transmission code and clicking at 61,000 miles.