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I have been getting the code for EGR Valv insuficient flow, so I replace my EGR Valve. The CEL stays off for 5 days and is now back. What else could be the problem!

Besides the above, it could also be a bad EVR (EGR Voltage Regulator).

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I am going to Windsor next week, and I don want any car problems at all!

I don't think that you need to worry too much about the P401. It basically means that you are spewing emissions into our atmosphere at a higher rate than normal. Get it fixed at your convenience.

1996 Contour SE Sedan 4D (Royal Blue)
Duratec V6 2.5L 24-valve DOHC
Automatic
75,000 miles
No Mods (unless you call the DMD a mod)
Replaced EGR valve (gunked up), EVR (EGR VR), PCV valve, and evaporative emissions hose (cracked).