ISX fuel mileage help

[jmickulin]

Yes it is an 870. I haven't done anything yet with the Delta-P sensor or exhaust back pressure sensor. If those sensors are like the other two I already replaced they have probably never been done. I will pull the EGR pipe away from the intake and unplug the EGR temp sensor and see if that stops the flow. Do you think proper programming is something I need to look into as well for mileage? As far as I know the truck is still set at all of its stock settings and hasn't been tuned or anything.