I bought a 97 Corolla that had been in a flood. I changed everything that needed to be changed. The only thing left is the check engine light comes on. The code is coming up "insufficient flow to the egr". I have changed out the egr valve and the code keeps popping up. I even cleaned it and soaked it in gas for a night. Any other ideas? The egr was used from a corolla with 59---. It doesn't run bad, just annoying check engine light.