I have a 1997 for f350 7.3...
My truck started driving rough and smoking heavy. Code read P0470
Pull the esps out, was clogged. cleaned it The connector was badly clogged, cleaned it also. check the end of the line had just a little crud at the end, clean it also...put all back together and started it. still rough and smoking, blueish white with puffs of gray...check codes again, this time P0472. So replaced the sensor. cleared the codes and got a new reading. no codes. However, still running the same.. I was told to blow or clean the line?? could that be it???