Ok, so on my 00 Eclipse 3.0 it started to idle funny....then the check engine light came on. So I scanned the car the code was PO400 which is a EGR flow malfunction. I then cleaned the EGR valve on it and it ran good for about 100 miles or so then the light came back on......have any of you guys ran into this code before? I was thinking about replacing either the EGR solonoid or Vacuum contol valve. Does anyone know if you can run a test on either of these?