I hope some of you or someone can help me with my situation of having to wash my car atleast once a week because my bumper is

COVERED

In black crap! It started to get really bad once i got my vafcII installed and tuned. This is really getting on my nerves because people write stuff in it!! lol
But does anyone else have this problem?
Is it supposed to run this rich or is it running too rich?
Or is this just normal and i should just shut up and deal?