I have seen somewhere, here I think, a pictorial of the procedure to clean the EGR ports. I have an elderly friend with a 97 F150 4.6L that needs more than just my verbal instructions. He lives too far away for me to go do it for him. After some resistance he's agreed to go OEM on the DPFE sensor..... I've searched and looked and looked but can't find that pictorial. HELP ! !