Thanks Steve the info that you gave me was a huge help.I called the moter vehical Dept.,Emissions branch and indicated to them that the test was done at a low or near idel speed of 830 rpm and they agreed this was the wrong. A free retest is forth comming on Friday 1/2/04. Sorry for the lack of info i was almost late for work. The vehical is a 1986 F-150 4.9L 6 cyl with a EEC IV controls. I,ll be going through the egr sysm today with some of the info you gave me. Thanks again!!