A senior Lexus tech/mechanic went with me on a test drive
We rode around town and I tried to duplicate past situations where my RX 350 would hesitate on a gas pedal input. I did not get a real good example. After a few miles he said I had somewhat of a habit of left foot on break pedal while right foot on gas pedal, which may confuse the computerized system as to "accel" or "brake?" Seems to make sense to me, and I have tried to avoid this anomaly. I now have fewer situations of the hesitation on acceleration.