I had the doors of my truck painted a few years ago and i noticed that they are a little darker in some spots than the rest of my truck (almost like a dirty white) how could i get these to blend? I think if i buff it real good with wax that it would do it?

Dupont makes a blending spray. It will dull new paint to make it look the same as noraml paint. Shops that do a lot of restoration use it so that If a peice is painted it will look like the original paint.
You can also try some polish on it and buff it in good, that might make the paint a little cleaner. Sounds like the painter might not have mixed the pint well or the primer underneath could be darker, white is bad for showing change in primer color if a too thin coat is applied.