code 71

What is your question?

rough idol to stalling at red lights after driving the car for about 20min in town. i have also just clean the whole system myself and i am wanting to know why this is still a problem. my only guess could be is that is the sensor on the bottom of the egr valve? any help would make my life so much better=] because i love my lexus and want to keep it tell it dieds at 600,000 miles=] lol well thanks to all that can help