[Blue Bowtie]

When the EGR valve is removed, you should try to clean out the EGR passages in the intake as much as possible. You can use a stiff wire (coat hanger), tube brushes, or whatever works to remove the buildup, then vacuum it out as best you can before installing the EGR valve again. Excessive buildup can be caused by incorrect mixture, oil burning, or excessive use of fuel additives, either by you or the fuel blender.