My 2008 IS250 AWD Lexus has had a problem since I purchased it new with the engine or aceleration stalling momentairly when hitting bumps..... The car does not die, but sort of hesitates for maybe 3 seconds and then takes off. It's almost like it is not getting gas or the engine is disengageed. I have advised the dealership but they could not get it happen durning their testing. It has happened to both my husband and myself on numerous occassions. I expected this to be in the latest recall today 7/6/10, but what I have found so far does not site the IS250 as being a model with the problem. It has happened since it purchase in 2008. Is anyone else out there having this problem?