[grfnkl]

You never got the cat converter checked? I posted that as a possibility awhile ago for ya. Oh well. Either way, Justin is right about the warranty for the 8yr, 80,000 miles. you can find that in your emissions section under your warranty booklet that should have been in the car when you bought it ( if bought new). Once you get the cat changed you'll see a major difference in the car! Your G/a almost sounds like what i went through mine, when i had the same problem....