Shon

I also have this exact same problem. My 2006 GS300 has completed all the recalls listed. Because this only happens rarely Lexus was unable to reproduce the problem to solve the issue. Let me know if you ever figure it out. I don't think it's caused by the temp because mine occurs after the engine is at normal temp. and the outside temp was around 65 degrees. The car always has been maintained at regular intervals and there are no warning lights. I'm just dreading the thought of one day stalling in the middle of traffic.... This is the only thing wrong with my GS. Everything else is great.