I test drove a couple of other cars same year and model and those cars didnt exhibit the same symptoms. Hence the conclusion that such behavior is not normal.
Any other suggestions ?

Also would someone kindly recommend a good lexus/import shop in NJ. I've tried contacting all the Mercedes independent shops and they pretty much refused to work on Japanese cars. They mentioned they only work on German automobiles.

__________________
Whether you think you can or cannot, Either way you're right!. by Henry Ford.