After you replace it, you still have the code.
I stumbled upon the following post and it seems to work (so far)
Had same problem with my 97. Over the course of a year and a half I checked or peplace everything in the circuit with no results. found the cure last month. Under the rear passenger side door is the fuel filter. Next to it is a metal tube with a fitting in it. Open the fitting and empty the line of any fuel. Clear the code and you should be good to go.
So, if you have the P0443 pop up, you may want to try to solution above BEFORE replacing the Vapor Canister Purge Valve or letting a shop lead you to replace your ECU.