My IS250's engine stutters when stopped at red light

What is your question?

My Lexus has 96K mi, bought it about 6 mo ago. Had it inspected several times with no issues found. Now, when I stop at red light, the engine stutters as though it may stop any minutes. Similar to what you would find with an old car. Except mine has all its maintenance done and its not old. Suggestions what it may be? Thank you!