Hey all... Here's the promised follow-up from my original post last week that mentioned some strange vibrations I was experiencing with this newly purchased '99 LS. When I originally went to look at this particular car a few weeks ago, as I was doing a customary 'walk-around' inspection, one thing I did is rev the engine up a bit with the transmission in Park and noticed it wasn't exactly what you'd call 'Lexus-smooth'. Actually I think a 15 year-old Pontiac Grand Am with the Quad-4 engine mig