A few weeks ago I got the P0401 code on my Taurus. So I took the EGR valve off and cleaned it real good to get rid of the carbon deposits. Earlier this week however, I got the P0402 code. Excessive flow. Could this be the Sensor? Also, last night I was driving and the car stalled out while I was driving. I pulled to the side of the road and the car started back up. THen it stalled out again on the way home and I pulled it off and it started back up. Could the excessive flow be choking out the engine?? Is that possible??