My truck started acting funny today, when in drive (or atleast the only gear ive noticed having a problem) it idles low. Also when i hit the gas it throws out white smoke, but not when idling just when I rev it. It just started doing it today on my way home from work and it ran fine all morning and for most of the way home, I just dont know what it could be.
It isnt running hot
It does seem to hesitate but no loss of power really
Also I have modifed exhaust and since it happened it seems to be alot quieter, almost as if its suffocating in my opinion.

its a 2003 Ram 1500 with the 5.7L Hemi Magnum