[bagged98]

hi everyone i have a 2001 grand prix 3.8 non supercharged car. iam trying to get it to pass emissions in my state. i have to codes coming up p0440 and p0403 one is evap other is egr. egr valve has been replaced and same with the fuel cap.the car does have 160 000 miles but runs like a champ no issues other than codes and not passing stupid state emissions.. but codes still popping up i cleared codes the other day by resetting the egr by unplugging the egr valve turning key on cleared the codes then turning off ignition right away then plugging egr back in and starting the car.the code was gone and stay gone for about 3 days then when i left this moring to go get it tested for emission ses light popped back on..so my thoughts are the car just took that long to relearn everything and kicked the light back on..what is the problem anyone? iam stumped i talked to one other person they said something about a problem with these cars and the pcm has to be re-flashed do to a reoccurring problem with the egr.anyone heard of that ?? any help would be great .thanks michael ...........ps please know what your talking about