Was the car running and then quit? Or drove OK but wouldn't restart. Did the engine overheat? Did you just get fuel? Backfire when driving?
You stated the engine ran as long as it was above 2000 RPM,Do you mean it ran without sspraying starting fluid in it? If thats the case the pump must be running.
There is a large vacuum hose from the idle valve to the air duct housing that comes off during backfires, If this is the case there won't be enough airflow at low RPMs to move the airflow sensor.
Mike