Ok so I bought my SHO about 2 months ago. When I test drove it, I knew it had a little problem with the rpm jumping up and down during light driving. Basically only when the gas is barely pressed. Well after me changing the transmission fluid 2 times, changed spark plugs, made a weep hole in intercooler ( helped let out a lot of gunky oil, car has 185,000 miles, will patch the 1/8th hole up with some fiberglass bondo when I feel most the oil is out) it still is shuddering while light driving. Its annoying but it still can drive just fine. But after looking into it, it probably is the Torque Converter. So I went and got 2 tubes of Shudder Fixx. I only drove it about 25 miles so far. The last 10 miles I have not noticed any rpm's jumping. So this could be a short term fix or a long term fix. I will have to see. Ill try to update for sure. Just crazy how a $10 tube (x2) could make a big drivetrain part start working right.